1.   If you stopped the flights, Soviet submarines would go undetected.

2.   As if to confirm this theory, no Northern Fleet submarines went on patrol for the next three months.

3.   But that projection was made before it became clear Tuesday that the submarine went down on Saturday.

4.   Every time it dives and resurfaces, a submarine goes through a cycle of compression and decompression.

5.   Nine agonizing days after the submarine went down, the rescue became a recovery.

6.   The control room where most of the crew works is below the tower, suggesting many sailors could not escape when the submarine went down.

7.   The submarine went down Saturday, and concerns about the dwindling oxygen supply aboard were heightening steadily Tuesday night.

8.   Ten Russian ships were in the area where the submarine went down.

9.   The control room where most of the crew work is below the tower, suggesting many sailors had no time to escape when the submarine went down.

10.   The submarine itself went down shortly after destroying the Union ship Housatonic.