How does a submarine with a troubled reputation end up teaching a superpower an expensive lesson? The answer sits in the unusual logic of undersea warfare. In 2000, during the multinational RIMPAC exercise, HMAS Waller, one of Australia’s Collins-class submarines, slipped through the protective layers around the USS Abraham Lincoln and achieved the simulated conditions of a successful torpedo attack. The result mattered far beyond one drill. It showed that a conventional submarine, if quiet enough and handled well enough, could threaten the centerpiece of a modern carrier strike group.
That outcome was especially striking because the Collins class had spent years under a cloud. Australia’s six boats, built as the country’s first domestically produced submarines, entered service burdened by engine failures, noise problems, software setbacks, and a stream of damaging public criticism. Yet the design also matched a very specific regional mission. At roughly 77 meters long with 70-day endurance, the Collins class was large for a diesel-electric boat, built to cover long distances across the Indo-Pacific rather than serve as a coastal curiosity. Australia needed range, persistence, and a submarine tailored to regional waters.
Its advantage was not glamour. It was silence. When running on battery power, a diesel-electric submarine can become extraordinarily difficult to detect. A nuclear submarine brings greater speed and endurance, but it also carries the constant acoustic burden of reactor support systems and cooling machinery. Conventional boats trade sustained pace for stealth. As the U.S. Naval Institute argued in a broader assessment of undersea force design, air-independent and battery-powered conventional submarines narrowed old assumptions about the permanent superiority of nuclear boats in every environment. Even before the newest AIP designs matured, the Collins class demonstrated the older truth behind that argument: if a submarine can disappear into local noise, shallow waters, and gaps in a defensive screen, cost and prestige stop mattering very much.
That is what made Waller’s simulated kill so important. Carrier strike groups are not protected by a single ring of escorts but by layered anti-submarine defenses: surface combatants, helicopters, maritime patrol aircraft, onboard sonar systems, and attack submarines. Those layers were built primarily to counter fast nuclear threats in open water. A slow, patient diesel-electric submarine exploiting cluttered conditions presents a different problem. It does not need to outrun the screen. It only needs one opening.
The lesson did not remain isolated to one Australian boat. Similar exercise results surfaced when Dutch, Australian, and Swedish conventional submarines penetrated high-end naval defenses in the same era. The Swedish Gotland’s well-known 2005 exercise performance against a U.S. carrier reinforced the same point from a different design path: a very quiet conventional submarine could force a major rethink in anti-submarine warfare. The larger implication was strategic rather than theatrical. Expensive capital ships still dominate power projection, but they operate inside a threat environment where relatively smaller undersea platforms can impose caution, complicate planning, and drain defensive resources.
The Collins class therefore occupies an unusual place in naval engineering history. It was neither a flawless program nor a dead end. It was a deeply imperfect platform that still proved operationally dangerous, and its service life has since been extended with upgrades into the 2040s. In that sense, the real significance of Waller’s exercise success was not that one submarine “sank” one carrier. It was that a criticized design exposed a durable truth about naval power: in the undersea contest, stealth can overturn reputation, doctrine, and cost in a single move.
