The nuclear submarine Kursk sank in the Barents Sea during a maritime exercise on this day in 2000. All 118 crew members died after international efforts to save them frustratingly failed.
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© Reuters
The May 2000 file picture shows the Kursk nuclear submarine docked at Vidyaevo naval base.
The Russian Oscar II class submarine K-141 Kursk was the pride of Russia's fleet, having symbolized the power and strength of the Russian Navy. Having been set afloat in 1994, the 154-meter-long nuclear sub had been in service for less than six years when it sank.
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© Reuters
A July 30, 2000 file picture shows the crew of the sunken Russian submarine Kursk lead by Captain Grigory Lyachin (R) during a naval parade which was held in Severomorsk.
The nuclear-powered cruise missile submarine could carry up to 130 people on board. At the time of the tragedy, 118 sailors and officers were on board, under the command of first rank captain Gennady Lyachin. Most of the crew members were under 30 years of age.

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© Oleg Lastochkin / RIA Novosti
Barents Sea. Kursk nuclear submarine raising zone. Russian Northern Fleet.
On August 12, Kursk was conducting naval exercise in the Barents Sea waters off Russia's coast in the north. The submarine was carrying 24 cruise missiles and 24 naval torpedoes.
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Norwegian seismic institute graphs show explosions detected by three monitoring stations from the area where the Russian nuclear submarine Kursk sank August 12, 2000.
According to the generally accepted theory, a hydrogen peroxide leak in the forward torpedo room led to the detonation of a torpedo warhead, triggering the explosion of more warheads about two minutes later. The second explosion was equivalent to around six tons of TNT and was large enough to register on seismographs across Northern Europe.
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A relative of a sailor who died aboard the Kursk submarine is offered a drink by a naval officer as she is comforted by another mourner during a ceremony held on a ship above the site where the submarine lies in the Barents Sea August 24, 2000.
With the sub having sunk at a depth of over a hundred meters, at least some of the crew were believed to have been alive after the explosions. Survivors huddled in the remaining sectors, but oxygen levels there dropped dramatically. According to experts, lives could have been saved if rescue operations had begun sooner.
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© Reuters
Air bubbles come from the Kursk nuclear submarine as it is lifted on steel cables under the Giant-4 barge in the Barents Sea.
International search and rescue efforts lasted for 10 days, but failed to save anyone on board. All the men aboard the Kursk were trapped in a watery grave, with divers who entered the sub a week after the tragedy discovering only dead bodies.
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The mother of a Kursk Naval officer Captain Andrei Silogav who died on board the Kursk nuclear submarine weeps at a funeral ceremony in the Ukrainian Black Sea port of Sevastopol, December 19, 2001.
The Kursk accident is widely regarded as one of the biggest national tragedies during Vladimir Putin's time as Russian president. It occurred early in Putin's first term, and the sunken vessel and failed rescue efforts caused anger and frustration not only among the perished sailors' families and loved ones, but nationally and worldwide.
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The conning-tower of the Kursk nuclear submarine (C) surfaces in a dock at the port of Roslyakovo near Murmansk, with the Giant-4 barge in the background, October 23, 2001.
There have been a number of theories about what might have caused the explosion on the sub. There are theories that the Kursk collided with an American submarine that was in the same waters at the time of the exercise. Others suggested that the vessel could have struck a mine left over from World War II.
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© Reuters
The conning-tower of the Kursk nuclear submarine surfaces in a dock of Roslyakovo port near Murmansk, October 23, 2001.
The wreckage of the submarine, including most of its hull but except the bow, was raised from the sea bed over a year after the tragedy. Potentially dangerous remains of the weapon load and nuclear reactors were also lifted from the ocean floor.
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© Alexander Demianchuk / Reuters
Mother of the Kursk submarine officer Alexey Mityayev grieves during his funeral ceremony at Serafimovskoe cemetery in St.Petersburg, November 17, 2001.
One hundred and fifteen bodies were removed from the wreck and buried in Russia, but three navy officers aboard Kursk were never found. A decree signed by President Putin posthumously awarded all the crew the Order of Courage, and the title of Hero of the Russian Federation was bestowed on the submarine's captain.
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© Alexey Kudenko / RIA Novosti
The monument to submarine sailors who died in peacetime, featuring the control room of the Kursk submarine.
With most of the wreckage recycled, only the deck cabin of the Kursk submarine remained whole. Its was preserved as a monument, having been erected in Russia's northern port of Murmansk. Monuments commemorating the tragedy are also now in other cities, including in Moscow.