A US nuclear attack submarine could have been responsible for the sinking of a French trawler off the Cornish coast, a submarine expert has said. The Bugaled Breizh sank off the Lizard on 15 January 2004, killing its five crew members. Expert Dominiques Salles has now submitted his report to French judges investigating the incident. He wants the US Navy to reveal the position of all of its nuclear attack submarines at the time of the sinking.