Kursk dents are a 'mystery'

Mysterious dents have been found on the wreck of the Kursk nuclear submarine.

It's been confirmed they were not caused by a collision with another submarine.

Investigators have also pulled out another six cruise missiles from the ship's carcass.

The chief military prosecutor wouldn't say what had caused the dents visible on the hull of the Kursk.

It was brought to dry dock in northern Russia last week after more than a year on the Barents Sea floor.

"It's wrong to say that the dents resulted from a collision which led to the catastrophe," said prosecutor Yuri Yakovlev.

Officials agree the first of two explosions in the Kursk's bow was caused by a practice torpedo, but opinions differ on what triggered that explosion.

Most experts believe it was caused by an internal malfunction, but Russian investigators say it could have been a collision with a Second World War mine, or a foreign submarine.