What You Need to Know: The Swedish Navy's Gotland-class submarine ... Before the Gotland-class incorporated the AIP system, only nuclear-powered submarines could stay submerged for weeks.
The Stirling AIP is powered by liquid oxygen ... In the late 2010s, the Swedish Navy began modernizing their fleet of Gotland-class submarines as part of an essential mid-life upgrade program.
What You Need to Know: In a 2005 war game, the Swedish diesel-powered submarine HMS Gotland stunned the U.S. Navy by "sinking ...