On August 12, 2000 (July 13, 2000 in the lunar calendar), Kursk, the world's most serious nuclear submarine accident, sank. At 2300 on August 12, 2000, the Russian Navy's nuclear submarine Kursk sank during an exercise in the Barents Sea, killing 118 officers and soldiers on board. This is by far the most serious nuclear submarine accident in the world. The Kursk, built in 1994 and commissioned in 1995, is Russia's latest and one of the largest strategic nuclear submarines in the world today. After the Kursk sank, Russia immediately organized rescue operations and invited Norway and British lifeguards to participate in the rescue, but it failed. On August 21, Russia announced the death of the officers and soldiers on board and stopped rescue work. There are still different opinions on the cause of the "Kursk" crash. The Russian military believes that it was caused by a collision with another foreign submarine. Comments: This happened in the past because Russia had no money for maintenance, but now it is not afraid of money.