1.   In the first weeks of the war, dozens of defenceless ships were sunk by submarines.

2.   Submarines sank all but one of the ships in the convoy.

3.   At dawn the next day, a Russian submarine sank it with a single torpedo.

4.   But that is not likely after a U.S. submarine accidentally sank a Japanese fishing boat in Hawaii, fueling distrust there of the U.S. military.

5.   It would be another half century, during World War I, before another submarine would sink an enemy ship.

6.   More than a week after a U.S. nuclear attack submarine accidentally sank a Japanese fishing boat near Hawaii, the Navy is still suppressing information about the incident.

7.   The crew has not been in radio contact with rescue ships since the submarine sank.

8.   The parts of the letter made public do not elaborate on what caused the submarine to sink.

9.   The submarine sank last weekend during naval maneuvers in the Barents Sea.

10.   The submarine sank five days later.