Argentine submarine find 'first step' to learning disaster's cause

Families of the victims have called for the ARA San Juan to be refloated, an enormous undertaking that authorities cautioned was likely beyond their means. Crushed from an implosion, the submarine was located at a depth of more than 900 meters (3,000 feet) in a desolate area of undersea craters and canyons 400 kilometers (250 miles) off the coast of Argentina. An underwater robot sent down by the Seabed Constructor, which specializes in ultra-deep water exploration, relayed 67,000 images of the sunken vessel.