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Wiki Wiki- (I had to look it up ;), I remember something about it now.)

Explosion
For more details on this topic, see Russian submarine Kursk explosion.
The Kursk sailed out to sea to perform an exercise of firing dummy torpedoes at Pyotr Velikiy, a Kirov class battlecruiser. On August 12, 2000 at 11:28 local time (07:28 UTC), the missiles were fired, but an explosion occurred soon after on Kursk. The only credible report to-date is that this was due to the failure and explosion of one of Kursk's new/developmental torpedoes. The chemical explosion blasted with the force of 100-250 kg of TNT and registered 2.2 on the Richter scale [1]. The submarine sank to a depth of 108 metres, approximately 135km (85 miles) off Severomorsk, at 69?40′N, 37?35′E. A second explosion 135 seconds after the initial event measured between 3.5 and 4.4 on the Richter scale, equivalent to 3-7 tons of TNT [2]. Either this explosion or the earlier one propelled large pieces of debris far back through the submarine.

Rescue Attempts

Though a rescue attempt was made by British and Norwegian teams, all sailors and officers aboard the Kursk perished. The first investigations suggested that most of the crew had died within minutes of the explosion. However journal entries show that many survived in the rear of the ship for hours after the blasts. Kursk was eventually raised from her grave by a Dutch team using the barge Giant 4, and 115 of the 118 dead were recovered and laid to rest in Russia. Russian officials have strenuously denied claims that the sub was carrying nuclear warheads. When the boat was raised by a salvage operation in 2001 there were considerable fears moving the wreck could trigger explosions.
According to the Raising the Kursk television show by the Science Channel:

?In June of 2002, the Russian Navy recovered the Kursk's bow section. Shortly afterwards, the Russian government investigation into the accident officially concluded that a faulty torpedo sank the Kursk in the Summer of 2000.