More than 100 Russian sailors are reportedly trapped in their nuclear-powered submarine on the sea bed off northern Russia, after technical faults apparently forced them to shut down the nuclear reactor, the navy said. Reuters reported that Russia's independent NTV television station said the cause of the accident was flooding of the torpedo tubes and front section of the submarine Kursk, and said a power shutdown might lead to problems with oxygen supplies. The navy could not be contacted to confirm the details of the accident. The head of the navy's press office, Igor Dygalo, said earlier that unspecified technical faults had forced the Kursk to settle on the sea bed after training exercises in the Barents Sea, most of which lies in the Arctic circle north of European Russia.