TIMELINE: Worst nuclear submarine accidents

(Reuters) - More than 20 people were killed and another 21 injured in an accident on a Russian nuclear submarine on Saturday, the Russian navy said.

Following is a chronology of major accidents involving nuclear submarines since 1968:

May-June 1968 - U.S. navy submarine Scorpion sinks with 99 men aboard east of Norfolk, Virginia.

March 4, 1970 - French submarine, the Eurydice, sinks with 57 crew off St. Tropez in the Mediterranean Sea.

April 12, 1970 - A Soviet November class nuclear-powered attack submarine sinks with 88 crew members in the Atlantic Ocean off Spain.

Aug 10, 1985 - An explosion on a Russian submarine at Chazma Bay, on the Pacific coast near Vladivostok, sends the lid of the reactor flying hundreds of meters with no trace of the 10 people working in the reactor.

April 7, 1989 - A Soviet Mike class attack submarine sinks off northern Norway with the loss of 42 lives after a fire.

Aug 12, 2000 - The Russian Oscar-II class submarine Kursk with 118 crew members sinks to the bottom of the Barents Sea after possibly a collision and two explosions on board.

February 9, 2001 - The Greenville, a 360-foot U.S. Navy submarine based at Pearl Harbor, sinks a Japanese trawler after colliding with it, killing nine civilians aboard the fishing boat.

Jan 2005 - One crewman dies after the U.S. nuclear submarine San Francisco runs aground off Guam in the Pacific Ocean. Another 23 crewmen were injured.

September 6, 2006 - Fire on board the Viktor-3 class Russian navy submarine St Daniel of Moscow, moored near the Finnish border, kills two crew members.

March 21, 2007 - Two British soldiers are killed and another injured on the Tireless nuclear submarine during an exercise in the Arctic.

Nov 8, 2008 - More than 20 people killed and another 21 injured on a Russian nuclear submarine in the Pacific.

Sources: Reuters; Greenpeace (www.greenpeace.org).