On August 12, 2000, the Russian Oscar II class submarine, Kursk sank in the Barents Sea. The generally accepted theory is that a leak of hydrogen peroxide in the forward torpedo room led to the detonation of a torpedo warhead, which in turn triggered the explosion of half a dozen other warheads about two minutes later. This second explosion was equivalent to about 3-7 tons of TNT and was large enough to register on seismographs across Northern Europe.
Despite a rescue attempt by British and Norwegian teams, all 118 sailors and officers aboard Kursk were lost. A Dutch team later recovered the wreckage and all of the bodies, which were laid to rest in Russia.
