• Japan and the U.S. are trying to figure out what caused the lethal collision of a U.S. destroyer, above, and a vast cargo ship in a busy shipping lane south of Tokyo.

The mystery collision — on a clear night between two ships equipped with advanced detection systems — flooded the destroyer’s sleeping areas, killing sevenl U.S. sailors and forcing the crew to scramble to keep the ship, the U.S.S. Fitzgerald, from foundering.