Explorers have discovered the world’s deepest shipwreck after 78 years: a US Navy destroyer escort that sank during World War II’s biggest naval battle. The explorers found the USS. Samuel B. Roberts – nicknamed ‘Sammy B’ – 6,985 metres below the surface of the Philippine Sea near Samar, the third-largest island of the Philippines. The wreck is snapped in half, and the two pieces lie just ten meters apart.