How One Machinist’s “ILLEGAL” Fix Made Torpedoes Stop Missing Targets
The story begins on July 24th, 1943, in the Pacific Ocean, approximately three hundred miles southeast of Truk Atoll. Lieutenant Commander Dan Daspit stares through the periscope of the USS Tanosa at the largest prize of his naval career. The 19,250-ton Japanese tanker Tonin Maru number three sits motionless after taking two torpedo hits to her engine room. She is a sitting duck waiting to be finished off by the American crew.
Fire one, Daspit commands from the control room. The Mark 14 torpedo streaks through crystal blue water, its wake drawing a deadly white line toward the enemy hull. There is a sudden impact as the telltale thump of steel striking steel echoes through the hull of the Tanosa. Then comes nothing. No explosion follows, no towering column of water rises into the air, and just silence remains.
Fire two, Daspit orders immediately. Another perfect hit lands, but it is another dud. What Daspit does not know is that he is about to waste thirteen more torpedoes on this helpless target. What he does not know is that his weapons carry a fatal flaw that has already cost American submarines their lives across the Pacific. What he does not know is that eight thousand meters away, an unnamed machinist in a Pearl Harbor torpedo shop is about to commit what the Navy considers an illegal act, one that will save thousands of American lives.
By the end of the day, the statistics are damning. Fifteen Mark 14 torpedoes are fired, resulting in thirteen direct hits and only two explosions. The most advanced torpedo in the world has just achieved an eighty-seven percent failure rate against a stationary target. The Mark 14 entered combat in December 1941 with an eighty percent failure rate. Of the first ninety-seven torpedoes fired by American submarines, only three enemy ships are sunk in total.
In two years of the Pacific War, American submarines fire over eight hundred torpedoes. Six hundred and forty of them fail to explode upon impact. Japanese merchant ships continue sailing unmolested while American submariners risk their lives for nothing. The Imperial Japanese Navy dismisses American submarine attacks as mere nuisance raids. Of the fifty-three United States submarines lost in World War II, twenty are sunk before October 1943, many after failed attacks that should have been decisive victories.
American boys are dying because their primary weapons simply do not work. What these submariners do not know is that salvation lies in the skilled hands of a machinist whose name history has forgotten, but whose illegal innovation will turn the tide of the Pacific War. The Mark 14 torpedo represents the pinnacle of 1920s naval technology, and therein lies the entire problem. Designed by the Navy Bureau of Ordnance starting in 1926, this twenty-one-foot, thirty-thousand-pound marvel costs ten thousand dollars each, which is five times the price of a new automobile.
Its revolutionary feature is the Mark 6 exploder. Equipped with magnetic influence and contact detonation systems, the magnetic component is supposed to detonate beneath enemy hulls, breaking their keels. It is kept so secret that no maintenance manual is ever distributed to the fleet. Here lies the fatal mistake made by the command. The Bureau of Ordnance conducts exactly one test in May 1926, where two torpedoes are fired at a derelict submarine. One fails completely, while the second explodes successfully.
With a fifty percent success rate, the Bureau declares the weapon ready for service. No further testing is conducted by the engineers. The United States submarine force goes to war with a weapon that has never been properly tested. Problems manifest themselves immediately. On December 14th, 1941, one week after Pearl Harbor, the USS Seawolf fires eight torpedoes at a Japanese freighter. Seven miss their mark completely, and the eighth hits squarely but fails to explode.
Similar reports flood in from across the Pacific theater. Torpedoes run too deep, passing harmlessly beneath their targets. Others detonate prematurely before reaching the enemy. Most frustrating are the duds, which are torpedoes that strike perfectly but fail to explode. The official response from the Navy is to blame the submarine commanders. Admiral Robert English, Commander Submarines Pacific, consistently sides with the Bureau of Ordnance, accusing his own skippers of a lack of initiative.
The Bureau maintains that nothing is wrong with their torpedoes. They claim the problem lies entirely with inadequate training. This creates a deadly feedback loop for the fleet. Submarine commanders know their weapons are defective, but they are strictly forbidden from modifying them. Meanwhile, Japanese convoys continue crossing the Pacific unmolested by American forces. The USS Wahoo fires four torpedoes at a Japanese destroyer from point-blank range, and all four hit their target, but none explode.
Commander Dudley Morton tells his crew in frustration that they might as well throw rocks at the enemy. Even when Admiral Charles Lockwood conducts unofficial tests in June 1942 proving that torpedoes run ten to fifteen feet deeper than set, the Bureau dismisses his findings out of hand. By mid-1942, over eight hundred torpedoes have been used in the Pacific War, and eighty percent have failed to detonate. Expert consensus from Navy brass remains stubbornly unchanged. They insist the torpedoes are perfect and the crews are incompetent.
The stakes could not possibly be higher. Every failed attack allows Japanese reinforcements to reach critical battlefields. Every enemy ship that escapes carries resources that will kill more Americans. The most infuriating aspect is not the technical problems themselves, but the institutional arrogance that refuses to acknowledge them. One submarine commander writes that they are fighting two enemies out there, the Japanese and their own Bureau of Ordnance, adding that at least the Japanese are actually trying to kill them.
The torpedo crisis represents much more than a technical failure. It is a strategic disaster threatening the entire Pacific campaign. American submarines, meant to be the most advanced underwater weapons in the world, have been neutered by bureaucratic incompetence and a stubborn refusal to admit error. At the Pearl Harbor Naval Shipyard in September 1943, the Submarine Tenders Machine Shop hums with desperate activity as damaged torpedoes return from failed patrols. Among the lathes and drill presses works a man whose name appears on no official records.
He is a civilian machinist hired after Pearl Harbor to support the submarine fleet. No fancy Naval Academy diploma hangs on his workshop wall to mark his achievements. No engineering degree validates his expertise to the brass. Instead, he possesses something much more valuable, which is the practical knowledge of a craftsman who understands how things actually work in the physical world. His callous hands have shaped metal for three decades. He learned his trade in depression-era machine shops where precision meant survival and where a thousandth of an inch could mean the difference between employment and starvation.
While Naval Academy graduates studied theoretical engineering, he mastered the practical art of making things work reliably. The machinist watches as another batch of Mark 14 torpedoes returns from patrol with warheads intact despite multiple hits on enemy targets. He listens as torpedo shop chief William Thompson briefs the crew on Admiral Lockwood’s latest directive. Somehow, they must find a way to make these weapons reliable for the fleet. The official Navy position remains stubbornly unchanged that nothing is wrong with the torpedoes.
Any modifications beyond routine maintenance are strictly forbidden by command. The Bureau of Ordnance has painted the screws holding the exploder mechanisms, creating tamper-evidence seals. Touch those screws, and you face a court-martial. But the machinist sees what naval engineers refuse to acknowledge. He has examined dozens of returned contact exploders, noting the exact same pattern of failure across all of them. The steel firing pins deform under impact, jamming within their guides and failing to trigger the detonation.
His moment of insight comes while examining the firing pin from the failed attack of the USS Tenosa. The steel pin shows clear deformation, being mushroomed at the tip and bent within its housing. He holds it up to the light, turning it slowly in his fingers. The steel is too heavy, he mutters to himself, noting it needs to be lighter and stronger. It is an observation that should be obvious to any engineer, but the Bureau has never considered it. They designed the contact exploder for the slower Mark 10 torpedo, then adapted it for the much faster Mark 14 without accounting for increased impact forces.
The machinist knows that an aluminum alloy would solve the problem completely. It is lighter than steel, but equally strong and resistant to deformation. The Navy has aluminum available, but using it would require modifying the exploder design. That is strictly illegal under current regulations. He looks around the shop, noting the piles of returned torpedoes, his frustrated colleagues, and patrol reports documenting failed missions. American submarines are dying because their weapons do not work properly. For a craftsman who spent his life making things work, the choice is clear.
On September 15th, 1943, at 2300 hours at the Pearl Harbor Submarine Base, the torpedo shop falls silent as the evening shift ends, but the machinist remains behind. He waits until footsteps fade away into the night, then quietly unlocks a storage locker containing his prized possession. Inside are pieces of a Mitsubishi A6M Zero fighter shot down during the attack on Pearl Harbor and salvaged from the harbor floor. Working carefully by flashlight, he examines the aircraft engine components.
The Japanese used a high-grade aluminum alloy that is lightweight, corrosion-resistant, incredibly strong, and perfect for his needs. He sets up his lathe in the far corner of the shop, positioning it where the noise will not carry. He is about to commit what the Navy considers a serious offense through the unauthorized modification of ordnance equipment. He is also about to save thousands of American lives. He begins with careful measurements of the original steel firing pin, noting dimensions, weight, and spring specifications.
Then he starts machining the aluminum alloy, shaping it to match the original design, but with subtle improvements. The new pin is thirty percent lighter than steel, but maintains the exact same structural strength. Hour by hour, he crafts new components, including firing pins, springs, and guide tracks. Each piece is precisely machined to tolerances measured in thousandths of an inch. He is not merely copying the original design; he is improving it by applying decades of practical knowledge to solve problems that Naval Academy engineers missed.
By dawn, he has completed his first prototype contact exploder. The machinist waits until the morning shift arrives, then approaches Chief Thompson with his unauthorized creation. Thompson examines the modified exploder, his face showing a mixture of admiration and deep concern. This could actually work, Thompson admits quietly. But you have just violated about a dozen Navy regulations doing this. Those regulations are killing our boys out there, the machinist replies quietly.
Thompson makes a command decision on the spot. Using his authority as shop chief, he authorizes a secret test of the device. They select a torpedo returned from a patrol of the USS Muscalonga, one that had struck a Japanese cruiser without exploding. They remove the original steel firing pin and install the aluminum replacement. The test setup is crude but effective, consisting of a hydraulic press and a steel plate designed to replicate the forces of a torpedo striking an enemy hull at forty-six knots.
The original exploder had failed under these exact conditions seventy percent of the time. The modified exploder fires perfectly on the first test, and then on the second and the third. Word spreads quickly through the submarine community at the base. Chief Thompson approaches Commander Art Taylor with the results of the test. Taylor examines the data carefully, then looks at the aluminum firing pin. Where did you get the aluminum, he asks. Shot down a Japanese fighter, comes the reply.
Taylor’s response echoes through the base office. That is illegal as hell, he says. Do it again to be sure. On October 3rd, 1943, in a Pearl Harbor conference room, Admiral Charles Lockwood enters carrying a manila folder that could either revolutionize submarine warfare or end his career entirely. Seated around the table are Bureau of Ordnance representatives, including Captain Ralph Christie, who has defended the Mark 14 design for two decades. Gentlemen, we need to discuss the contact exploder problem, Lockwood begins the meeting.
Christie’s response is immediate and defensive. There is no contact exploder problem, he insists. The issue lies entirely with improper maintenance and poor marksmanship by the crews. Lockwood opens his folder, revealing photographs of deformed firing pins and test data from the aluminum modifications. These results say otherwise, Lockwood counters. The room erupts in immediate protest. This is completely unauthorized, Christie says as he slams his fist on the table. Your people have violated explicit orders from command.
My people have solved a problem that has been killing American submariners for two years, Lockwood snaps back. Christie stands up, his face red with fury. Those torpedoes were designed by the finest naval engineers in the country, he argues. They have undergone extensive testing at Newport, and the specifications are perfect. Then explain the patrol of the USS Tenosa, Lockwood challenges. Fifteen torpedoes fired, thirteen hits, and two explosions against a stationary target. That is either equipment malfunction, poor maintenance, substandard training, or substandard torpedo design.
The argument escalates as other Bureau representatives join Christie’s defense. They cite regulations, design specifications, and theoretical performance data. They question Lockwood’s authority, his testing methods, and even his loyalty to the service. But Lockwood has an ace up his sleeve in the form of Albert Einstein’s analysis. The Bureau had consulted Professor Einstein at Princeton about the firing pin problem months earlier. His conclusion was that steel pins deform under high-speed impact. His recommendation was to create a void between the outer shell and the firing mechanism.
Christie’s face pales visibly at this revelation. The Bureau had received Einstein’s advice, but never implemented it, considering the physicist’s recommendations irrelevant to naval engineering. Einstein recommended structural changes we deemed unnecessary, while my machinists actually fixed the problem, Lockwood states. The debate continues for three grueling hours. Bureau representatives argue that unauthorized modifications violate the chain of command, endanger standardization, and could compromise safety across the fleet.
They demand all modified exploders be immediately recalled and replaced with standard parts. Lockwood’s response is devastating in its simplicity. Are you ordering me to reinstall defective exploders in torpedoes that will be used against enemy targets? he asks the room. The question hangs in the air like smoke from a fired gun. Every man in the room understands the implications of the question. Ordering the restoration of known defective equipment would be criminal negligence of the highest order.
Christie attempts one final argument, claiming the aluminum modifications have not undergone proper testing protocols and that they do not know their long-term reliability. We know the steel versions have an eighty percent failure rate, Lockwood counters. The aluminum versions have passed every single test we put them through. At this crucial moment, Admiral Chester Nimitz enters the room. As Commander in Chief of the Pacific Fleet, his word is absolute and final. The room falls completely silent.
Gentlemen, I have reviewed the test data and the patrol reports, Nimitz announces. Admiral Lockwood, your machinists have accomplished what the Bureau failed to do. They have made our torpedoes work. Christie makes one last desperate appeal to the commander. Sir, these modifications violate established procurement procedures, he protests. Nimitz cuts him off without hesitation. Captain Christy, our submarines have been going to war with defective weapons for two years, the admiral states. My concern is not procurement procedures. It is winning this war.
The admiral’s decision is swift and final. All submarine torpedoes will be retrofitted with modified exploders immediately. Furthermore, he authorizes expanded production using any available aluminum sources in the theater. Christie slumps in his chair, realizing that his Bureau’s reputation lies in total ruins. Two decades of design work have been overturned by an unnamed machinist working with scrap metal in a corner shop.
The illegal fix has officially become standard policy for the fleet. Within weeks, every submarine in the Pacific Fleet will carry torpedoes equipped with firing pins machined from enemy aircraft remains. On November 8th, 1943, the USS Sculpin operates two hundred miles northeast of the Gilbert Islands. Commander Fred Conaway peers through his periscope at every submarine commander’s ultimate dream. A Japanese aircraft carrier is steaming directly toward his position across the ocean swell.
The Zuikaku, a veteran of Pearl Harbor and the Coral Sea, cuts through the Pacific swells with destroyer escorts, completely unaware of the American submarine lying in wait nearby. Battle stations torpedo, Conaway orders quietly through the intercom. What makes this moment different is the palpable confidence radiating through the Sculpin torpedo room. For the first time in the war, American submariners are loading weapons they trust completely and without reservation.
Each Mark 14 carries a contact exploder equipped with the machinist’s aluminum firing pin. Testing data has been remarkable, showing ninety-four percent reliability under all impact conditions compared to the original twenty percent success rate of the steel components. Torpedo room ready, sir, reports Chief Torpedo Man Jake Morrison. All six tubes are loaded with the modified fish. The aluminum exploders underwent intensive testing throughout October at Kahoolawe Island, where Commander Art Taylor supervised dozens of test firings against steel targets.
The results exceeded all expectations. Aluminum pins fired consistently and showed no deformation whatsoever after repeated impacts. More importantly, the new exploders performed flawlessly at exact impact angles that had caused previous failures in the field. The perpendicular hits that had frustrated the USS Tinosa now resulted in devastating explosions against the target hulls. Range is one hundred and twenty yards and closing fast. Target speed is twelve knots. Conaway calculates the firing solution with mathematical precision.
Unlike previous attacks where commanders had to account for torpedo unreliability, he can now focus entirely on navigation and tactical timing. Fire one, fire two, fire three, he commands. The torpedoes streak toward the Zuikaku with deadly precision. Their aluminum firing pins, machined from Japanese aircraft remains, are about to exact a terrible revenge for Pearl Harbor. The first torpedo strikes the carrier’s port side amidships with a massive shock.
The aluminum pin fires instantly upon impact, detonating six hundred and eighty pounds of Torpex explosive inside the hull. A massive fireball erupts from the Zuikaku, sending debris hundreds of feet into the sky. The second torpedo hits forward of the island superstructure, punching through the flight deck and exploding deep within the ship’s vitals. Aviation fuel ignites in a secondary explosion visible miles away across the water.
The third torpedo strikes the destroyer escort Yamagumo as she turns to investigate the attack. The aluminum firing pin performs perfectly once again, breaking the destroyer’s back and sending her to the bottom of the ocean within four minutes. But the most remarkable aspect of the engagement is not the tactical success itself, but the psychological transformation of the submarine crew. For two years, American submariners had approached targets with grim determination tempered by the knowledge that their weapons might fail them at the moment of truth.
Now they attack with absolute confidence in their gear. All torpedoes functioned exactly as designed, Conaway writes in his official patrol report later. Contact exploders performed flawlessly. Recommend immediate implementation across all submarine commands. The success at the Zuikaku represents just one victory in a broader transformation occurring across the entire Pacific theater. American submarines equipped with the modified torpedoes achieve unprecedented success rates against the enemy.
The USS Wahoo under Lieutenant Commander Dudley Morton sinks four Japanese merchant ships in a single patrol. This is the exact same submarine that had previously watched enemy ships sail away unharmed after direct hits. The USS Silversides destroys three cargo vessels carrying critical supplies to Japanese garrisons. The USS Tang begins the patrol that will make her the most successful American submarine of the war.
The kill ratio statistics tell the story of this profound transformation clearly. Before the aluminum modifications, from December 1941 to September 1943, submarines fired 1,474 torpedoes and sank 180 enemy ships, achieving a success rate of 1.2 percent. After the aluminum modifications, from October 1943 to August 1945, they fired 8,214 torpedoes and sank 1,198 enemy ships, raising the success rate to 14.6 percent.
The Japanese response reveals the staggering magnitude of this change in the war. Imperial Navy communications intercepted by American codebreakers show growing alarm about submarine effectiveness across the board. Rear Admiral Ryunosuke Kusaka writes to the Naval General Staff that American submarine attacks have become devastatingly effective. He notes that previous nuisance raids have transformed into coordinated campaigns that threaten their entire supply network.
Commander Mochitsura Hashimoto of the I-58 observes that the American torpedoes that once failed to explode now function with terrifying reliability. He adds that their merchant captains report submarine attacks have now become absolute death sentences. The most telling comment comes from Captain Tamichi Hara, who notes that something has fundamentally changed in American torpedo technology. Their weapons now explode upon every impact, he says, adding that they must assume every submarine attack will be successful.
The human and material cost to Japan becomes staggering as a result. Monthly shipping losses, which averaged fifty thousand tons during 1942 and 1943, skyrocket to over three hundred thousand tons by early 1944. Critical raw materials stop reaching Japanese factories on the home islands. Food shipments to isolated island garrisons are cut by sixty percent, starving the defenders. By December 1943, American submarines are sinking Japanese ships much faster than their shipyards can possibly replace them.
The Pacific War has turned decisively in America’s favor, thanks entirely to aluminum firing pins machined from enemy aircraft by a man whose name appears on no official records anywhere. On August 15th, 1945, Emperor Hirohito’s surrender broadcast echoes across Tokyo Bay as World War II officially comes to an end. Aboard the battleship Missouri, General MacArthur accepts Japan’s formal surrender while American submarines patrol nearby waters, their torpedo rooms finally equipped with weapons that actually work.
The final statistics reveal the true magnitude of one unnamed machinist’s contribution to history. Total Japanese merchant vessels sunk reach 1,178 ships in total. Total tonnage destroyed reaches 5,324,100 tons. The percentage of total sinkings achieved by submarines is fifty-five percent. Of the 214 American submarines that conducted war patrols, those equipped with the aluminum firing pins achieved success rates fifteen times higher than boats carrying the original steel components.
A simple material change transformed the entire outcome of the Pacific War. The most powerful testimony comes from the men who lived through the dangerous transformation firsthand. Torpedo Man First Class Robert Ward of the USS Wahoo writes home to his family that he cannot tell them details because of wartime censorship, but notes that somebody back home finally fixed their fish so that they work every time, concluding that because of them, he was able to come home alive.
Lieutenant Commander Dan Daspit returns to Pearl Harbor in January 1944, and his very first action is visiting the torpedo shop where the aluminum modifications were born. I need to thank the man who fixed our exploders, Daspit tells Chief Thompson upon arrival. Thompson simply shakes his head and explains that he is not there anymore, having been transferred to another base without ever leaving his name on any official paperwork.
This anonymity becomes the machinist’s most remarkable characteristic in the history of the conflict. While Admiral Lockwood receives the Distinguished Service Medal and Commander Mommsen earns the Legion of Merit for solving the torpedo crisis, the man who actually created the technical solution disappears completely into history. No photographs document his appearance. No service records preserve his true identity. No metal citations honor his immense contribution to the nation.
The machinist who saved thousands of American lives and helped win the Pacific War remains officially invisible to the world. Postwar investigations reveal that the aluminum firing pin design was so effective that it influenced torpedo development for decades to come. The Mark 48 torpedo, which served as America’s primary submarine weapon from 1972 to the present day, incorporates firing pin technology directly descended from those wartime aluminum modifications made in a makeshift shop.
Even today, torpedo technicians at the Naval Submarine Base New London study the World War II aluminum modifications as classic examples of practical engineering excellence under pressure. The original firing pins preserved in the submarine force museum remain enduring testaments to American ingenuity when backed into a corner. The moral lesson transcends military history entirely. When institutional arrogance meets practical necessity, skilled craftsmen often succeed where theoretical experts fail.
The machinist’s story proves that solutions sometimes come from unexpected sources, not from advanced academic degrees or official authority, but from skilled hands and clear thinking in times of crisis. As one submarine veteran observed decades later, admirals plan battles, but ordinary machinists win wars. The man who fixed America’s torpedoes asked for no public recognition, left behind no personal memoir, and claimed no credit for his work.
His legacy lives on in every successful torpedo attack that followed, in every American submariner who came home alive to his family, and in the simple truth that sometimes the most important victories in human history belong to quiet heroes whose names we will never truly know.
