The Unknown NATO Walrus-Class Submarines 'Sunk' a US Navy Nuclear Aircraft Carrier and 7 Escort Vessels Back in 1999 in a Simulation and Come Armed with Torpedoes, Harpoon and Tomahawk Missiles

The Royal Netherlands Navy’s three Walrus-class submarines are diesel-electric attack boats that have remained central to Dutch undersea capability, with their service life extended into the 2030s. A new report examines how these submarines would perform in a 1999-style NATO simulation, alleging they “sunk” a US Navy nuclear aircraft carrier and seven escort vessels. The Walrus-class has faced a difficult history—construction delays, a fire in the command center, and design finalization issues after the first ships were laid down—but it entered service in 1990 (Zeeleeuw) and 1992 (Walrus). Replacement planning points to the Orka-class.