Picture the biggest warship you have ever seen. Now triple it. The USS Abraham Lincoln is a floating city powered by two nuclear reactors carrying 90 combat aircraft and a crew of 5,600. She cost over 4.5 billion to build. She never sails without an armada of cruisers, destroyers, and nuclear attack subgay submarines whose only job is to make sure nothing gets close to her.

The United States Navy considered this defensive shield unbreakable. In the summer of 2000, a diesel electric submarine crewed by a handful of Australians crawled straight through that shield without triggering a single alarm. She parked herself at point blank range, raised her periscope indicate formation, and photographed the carrier through a torpedo crosshair.

If this had been a real fight, the Abraham Lincoln and everyone at Dayhur would have been on the ocean floor before the escorts even knew something was wrong. The submarine that pulled this off, the HMAS Waller, was a boat that Australian newspapers had spent years calling a national embarrassment.

Her own country did not believe in her. The most powerful Navy in history was about to wish they had. The punchline is devastating, but the setup is even better because this is not a story about a lucky shot or a simulation quirk. This is the story of how the most mocked military program in Australian history produced one of the most consequential tactical demonstrations of the modern era.

And to tell it properly, we need to start with the insult. In the late 1990s, the Collins class submarine was the biggest punchline in Australian defense. The program had begun with staggering ambition a decade earlier when the Royal Australian Navy decided to replace its aging Oberon class boats with something revolutionary. the largest, most capable diesel electric submarine ever built.

Designed specifically for the vast patrol distances of the Indo-acific. The contract went to Swedish ship builder Cockhams, partnering with the Australian submarine corporation in Adelaide. Six boats, 5 billion Australian dollars, a sovereign submarine building industry created from scratch.

On paper, it was visionary. In reality, it was a catastrophe in slow motion. The first boat, HMAS Collins, launched in 1996, and the failures cascaded. Diesel engines broke down constantly. Fuel contamination corroded critical internals. Water leaked where water should never leak. The propeller, redesigned late in the process without proper retesting, generated catastrophic cavitation noise underwater.

For a submarine that was supposed to be among the quietest in the world, this was the equivalent of strapping a loudspeaker to the hole. The combat system fared even worse. The original software integration between the Swedish Hole and the American Webon package collapsed so completely that the entire system had to be scrapped and replaced from scratch.

Periscopes shook until the image blurred. Communications gear was outdated before the boats entered service. Welding defects riddled the bow sections built by the Swedish subcontractors, though the Australianbuilt sections were largely clean. A nuance that nobody in the press cared about.

The media feeding frenzy was merciless. Australian newspapers stamped the submarines with a label that stuck for years, dud subs. Columnists competed to coin the most vicious description. One compared the noise signature to a rock concert. Politicians weaponized the program during election campaigns.

A devastating 1999 government review. The Macintosh Prescott report declared the submarines unfit for operations and the entire project in crisis. The report noted that Australia’s strategic circumstances would have to be extremely serious to risk deploying these submarines in their current state. That sentence alone was enough to bury public confidence for years.

Now, here is where the story pivots because most people heard the noise and stopped listening. What they missed was the quiet. Engineers had been working through the problems methodically. The propellers were redesigned. The whole flow issues were corrected. The diesel engines were rebuilt. The hopeless combat system was replaced with a functional American alternative.

Piece by piece, bolt by bolt, the Collins class was being transformed from a procurement disaster into something nobody expected, a genuinely lethal weapons platform. The third boat in the class, HMAS Waller, commissioned in July 1999, entered service with significantly fewer defects than her older sisters.

But by then the reputation was already set in concrete. The Australian public saw a joke. American submariners who operated nuclear boats with unlimited range and reactor powered speed looked at the Collins class and saw a diesel relic from a previous century. When HMAS Waller sailed to Hawaii for Rimack 2000, the rim of the Pacific exercise, the largest international naval war game on Earth, nobody was expecting her to do anything remarkable.

That expectation was the first mistake. Understanding the second mistake requires understanding what the Waller was up against. The USS Abraham Lincoln hull number CVN72 is a Nimitz class nuclearpowered aircraft carrier commissioned in 1989. She stretches over 332 m from bow to Stern. Two Westinghouse A4W nuclear reactors generate 260,000 shaft horsepower.

pushing this 100,000 ton steel city past 30 knots. Her flight deck spans more than 4 1/2 acres and operates up to 90 aircraft. Super Hornets, Hawkeye early warning planes, Seahawk helicopters. Her crew tops 5,600, a population larger than most Australian country towns. She cost over$4.5 billion to build, and her midlife reactor refueling alone ran to 2.

6 6 billion more. But the carrier is not the weapon. The carrier strike group is the weapon. And in the year 2000, the formation protecting the Abraham Lincoln was the most formidable anti-ubmarine barrier ever put to sea. Start with the outer ring. Ticeroga class guided missile cruisers carrying the Eegis combat system, a radar and weapons network so advanced it could track over a 100 airborne targets simultaneously while coordinating anti-ubmarine operations across hundreds of square miles of ocean. These cruisers alone cost over a billion dollars each and carried their own complement of anti-ubmarine torpedoes. Move inward and you hit the Arley Burke class destroyers. Each one equipped with whole-mounted sonar, towed sonar arrays that streamed thousands of feet behind the ship, and anti-ubmarine torpedo launchers ready to drop ordinance on any contact within seconds. Below the surface, Los Angeles class

nuclear attack submarines patrolled assigned sectors. Each one 110 m predator carrying its own Mark 48 torpedoes and passive sonar arrays so sensitive they could hear a contact closing from miles away. These boats were built for one purpose, to find and eliminate enemy submarines before those submarines got anywhere near the carrier.

Above the waves, P3 Orion maritime patrol aircraft flew racrack patterns, dropping sauna boys by the dozen. Hundreds of floating microphones creating a vast acoustic drag net stretching across the operational area. The whole package cost upward of $20 billion and embodied a doctrine the United States Navy treated as gospel. Nothing gets through this screen.

The Americans believed this absolutely and they believed it for a reason that was also their blind spot. For decades, US anti-ubmarine warfare had been optimized for one opponent. Nuclear submarines. Soviet boomers, Russian attack boats, Chinese nuclearpowered vessels expanding into the Pacific.

These were the threats that shaped American sonar calibration, training protocols, and tactical doctrine. And nuclear submarines share one inescapable vulnerability, a reactor that never shuts off. Cooling pumps run continuously, producing a low hum that trained operators can detect. American submariners knew this acoustic fingerprint intimately. They hunted it.

Their entire philosophy assumed that the threat made noise. HMAS Waller did not make noise. That was the second mistake. A diesel electric submarine runs loud on the surface. Diesels charging battery banks. But once she dives and switches to stored electricity, the physics change completely.

No turbines, no coolant pumps, no reactor hum. The electric motor turns the propeller with almost no mechanical signature. The boat becomes quieter than the ocean itself. And the Collins class had an additional trick that amplified this advantage to an absurd degree. The entire hole was wrapped in anacoic tiles, rubberized panels that absorbed active sonar pings instead of bouncing them back.

A passive sonar could not hear the waller because she was not making sound. An active sonar could not see her because its own signal vanished into those tiles like a shout absorbed by fog. She was, in the language of acoustic warfare, a black hole. Rimac 2000 kicked off on the 30th of May and ran through the 6th of July with over 50 warships, 200 aircraft, and 22,000 personnel from seven nations operating in waters off Hawaii under the command of Vice Admiral Dennis McInn.

HMAS Waller started the exercise in a friendly role, the first Australian submarine ever to operate as a fully integrated component of a US carrier battle group. Her job was to hunt enemy submarines threatening the Abraham Lincoln. She did this so effectively that American officers were openly surprised.

But that was just the warm-up act. The real show began when the exercise controllers switched her role. Suddenly, the Waller was no longer a guard dog. She was the wolf. Her new mission, penetrate the carrier strike group’s defenses and simulate an attack on the Abraham Lincoln. This was the scenario where American dominance was supposed to be absolute.

This was the demonstration that justified $20 billion of defensive hardware. This was the script that every American exercise had followed for years. The adversary gets found, tracked, and neutralized before reaching weapons range. The Waller’s captain tore up that script and wrote a new one.

He took the boat deep below the thermocline, a temperature boundary in the ocean where warmer surface water meets colder deep water. This boundary is not just a temperature shift. It is an acoustic wall. Sonar signals hitting the thermocline bend, scatter, and lose coherence, refracting away from targets sitting beneath the gradient like light bending through uneven glass.

American surface sensors pinging downward got distorted, fragmented returns. Their sophisticated sonar suites were designed to burn through this interference when hunting nuclear submarines because nuclear boats still emitted a continuous reactor hum that gave the sonar something to lock onto even through the thermocline distortion.

But the Waller was not emitting anything. She was a silent object hiding behind a curtain of physics that American technology could not cleanly penetrate without an acoustic signature to target. Then the captain cut the diesels, switched to batteries, and shut down every non-essential system aboard. Air conditioning went off.

Lighting dropped to emergency minimums. Galley equipment shut down. The boat became a dark, hot steel coffin, drifting in absolute silence. Powered by nothing but stored electricity and crewed by men breathing recycled air in near darkness. The American search machine cranked into full gear.

Destroyers swept the ocean with whole-mounted sonars and towed arrays. P3 Orions dropped sauna boyoy patterns, listening for any whisper of machinery below the surface. Los Angeles class attack submarines prowled their sectors. passive arrays straining for the faintest trace of propulsion. They heard the ocean. They heard marine life.

They heard their own ships. They did not hear HMAS Waller. The Waller did not chase the carrier. She did not attempt to outrun the escorts or dash through gaps in the screen. Speed would have meant noise, and noise would have meant detection. Instead, the Australian captain employed a tactic older than submarines themselves.

Ambush by patience. He calculated the Abraham Lincoln’s projected course from the exercise parameters, factored in the carrier’s known turning patterns and operational habits, positioned the Waller along the most probable path, and waited. Hours of waiting in a dark, sweltering submarine running on battery power with no air conditioning, condensation dripping from the overhead, the crew sitting at their stations in near total silence because even footsteps carry through a hole.

A crocodile in dark water, motionless, invisible, patient beyond what most humans would consider reasonable, she crept forward at walking speed, sometimes barely enough thrust to maintain depth control against the ocean currents pushing against her hole. At those velocities, the biological noise of the Pacific was louder than anything her electric motor produced.

Shrimp clicking in the deep were louder. The natural groan of the ocean floor was louder. The Waller was the quietest object in her own environment. The American screen passed around her or over her. The Eegis cruisers, ships whose combat systems alone cost more than the entire Collins program, registered nothing.

The nuclear attack submarines, each crewed by 130 of the best trained submariners in the world, caught nothing. The Sonoule network heard empty water where HMAS Waller was sitting with a full load of Mark 48 heavyweight torpedoes and a crew that had not made a sound in hours. Then the Waller broke the surface with her periscope inside the inner defensive ring of the carrier strike group.

She was at ideal torpedo range. The Abraham Lincoln filled the periscope optic. Not a distant silhouette on the horizon, but a towering wall of gray steel so close that a miss was a physical impossibility. Each Mark 48 torpedo in the Waller’s tubes carried a 295 kg warhead and could close on target at over 55 knots.

The Australian crew photographed the carrier’s hole through the crosshair, locked a firing solution, and transmitted the simulated torpedo launch. In the cold language of naval war games, the USS Abraham Lincoln was gone. $4.5 billion dollars of American engineering eliminated by a submarine running on rechargeable batteries.

And the Waller had already taken two scalps before reaching the carrier. On the way in, she had engaged and scored simulated hits on two Los Angeles class nuclear attack submarines. The very boats designed to prevent exactly this from happening. Two $600 million nuclear predators caught and neutralized by the boat Australian papers called a rusty bucket.

The reaction at command level was not polite professional acknowledgement. It was shock. The myth of the invulnerable carrier strike group had not been dented by a superpower rival with bottomless resources. It had been punctured by a handful of Australians aboard the most publicly ridiculed submarine in the Western world.

If the Waller could do this during a peacetime exercise where everyone knew she was out there, what could a modern Chinese dieselbo do in the Taiwan Strait during a real conflict? What could Iranian kiloclass submarines do in the shallow, acoustically cluttered waters of the Persian Gulf? What could a dozen North Korean coastal boats do to a carrier operating near the Korean Peninsula? The Waller had not just scored a simulated hit on the Abraham Lincoln.

She had blown a hole in American strategic assumptions wide enough to sail an aircraft carrier through. Consider the maths. A single Collins class submarine cost roughly 1 billion Australian. The carrier strike group she had just penetrated was worth north of 20 billion US.

If a nation could build 10 diesel electric submarines for the price of one American carrier group and any one of those submarines could potentially eliminate the centerpiece of that group, then the entire costbenefit calculation of American naval power projection was in serious trouble. This was not a theoretical argument anymore.

The Waller had just demonstrated it with photographic evidence and then she proved it was not a fluke. The following year, during Operation Tandem Thrust 2001, HMAS Waller operated in waters barely 70 meters deep, scarcely more than the submarine’s own length, and scored simulated eliminations on two US Navy amphibious assault ships carrying hundreds of Marines.

She was eventually declared neutralized herself later in the exercise, but the point had been hammered home with brutal clarity. In 2003, during another multinational exercise off Australia’s coast, Waller and sisterboat HMAS Ranken went head-to-head with American nuclear opposition. Again, Waller simulated the elimination of a Los Angeles class attack submarine.

Australian Commodore Mike Deaks noted with unmistakable satisfaction that the Americans had been visibly shaken at the conclusion. Three exercises, three years, consistent results. The Collins class was not a joke anymore. It was a case study in what happens when a well-trained crew exploits an asymmetric advantage that the opposition has not prepared for.

The noise problems that fueled years of mockery had been fixed. The combat system had been replaced. The engines had been rebuilt. What emerged from all those repairs was the largest conventionally powered submarine on Earth. 77 m long, 3,353 tons submerged, six torpedo tubes, 22 heavyweight torpedoes, sub harpoon missiles, a surface range of 11,000 nautical miles, and a submerged battery endurance of 480 nautical miles at 4 knots in near total silence.

Every one of those specifications had been questioned, mocked, or dismissed at some point during the program. Every one of them turned out to be exactly what was needed to crack the most defended formation on the ocean. The United States Navy responded with the seriousness the situation demanded. American anti-ubmarine warfare doctrine was fundamentally rewritten to account for the diesel electric threat that commanders had spent decades dismissing as irrelevant.

The US Navy began leasing Swedish Gotland class submarines, widely considered the quietest conventional boats in existence, and regularly inviting Collinsclass boats to participate in American exercises. These were not courtesy invitations extended to a minor ally for diplomatic appearances. The Australian and Swedish submarines were brought in as dedicated adversaries whose explicit job was to hunt American carriers and surface groups repeatedly, exercise after exercise, so that American sonar operators and tactical officers could learn what near silence sounds like and develop tactics to counter something that produces almost no detectable signature. The fact that the US Navy was paying real money to train against the exact category of submarine it had previously dismissed as a Cold War leftover tells you everything about how badly the Waller rattled the American

naval establishment. The lesson was expensive, public, and impossible to ignore. In 2006, the Mark 48 torpedoes aboard the Collins class were upgraded to the Mod 7 Seabbass variant jointly developed with the Americans. Two years later, during Rimac 2008, HMAS Waller became the first submarine in either Navy to fire an armed version of the new weapon.

Her target, the decommissioned Spruent class destroyer USS Fletcher. One torpedo, one hit, one confirmed elimination with live ordinance. The Dud sub had just proven in the most literal way possible that she could find a target, reach it undetected, and put a heavyweight torpedo through its hole. There is an irony in the Waller’s name that fits this story so perfectly it feels scripted.

The submarine was named for Captain Hector Waller who commanded the scrap iron flotilla during the Second World War. Five battered ancient destroyers that the Germans mocked by name. The Australians wore that insult like a medal. Captain Waller later commanded the cruiser HMAS Perth and went down with his ship during the Battle of Sunda Strait on the 1st of March 1942.

Fighting a Japanese force that outnumbered and outgunned him in every category. The tradition of taking equipment that everyone else has written off and turning it into something lethal is not a fluke of the Collins program. It is encoded in the name painted on the submarine’s hull. The Rimac 2000 incident remains one of the most referenced episodes in modern naval warfare education.

It appears in war college sylli, defense white paper papers, and strategic procurement debates on every continent. Whenever a nation evaluates diesel electric submarines for coastal defense, the Waller and the Abraham Lincoln enter the conversation. Whenever an American admiral argues for anti-ubmarine warfare funding, that periscope photograph is the argument that needs no caption.

The Collins program itself remains far from perfect. As recently as late 2024, five of six boats were simultaneously out of action. The program sits back on Australia’s project of concern list. Australia is transitioning to nuclearpowered submarines under the AUS pact with the United States and the United Kingdom.

An acknowledgement that diesel electric propulsion has limits for long range Indo-Pacific operations. But the Waller’s legacy is not about the Collins program’s maintenance record or its procurement scandals. It is about a crew that took a submarine everyone had given up on, sailed it into the teeth of the most powerful naval formation ever assembled, and proved that the emperor had no sonar.

The Americans had the money. The Americans had the technology. The Americans had the doctrine. The Australians had silence, patience, and a boat named after a man who never stopped fighting in a ship everyone said was finished. The result sits in a classified file somewhere in the Pentagon. A photograph of a 4.5 billion dollar super carrier framed in the crosshair of a periscope that belonged to a diesel submarine the world called junk. No ceremony followed.

No speeches were given. The crew of the Waller went home to HMAS Sterling in Western Australia, had a cold beer, and complained about the maintenance schedule. That is the Australian way. Do the thing nobody thought possible.