1.   After that, annual inspections test fire doors, watertight doors, fire pumps, sprinkler systems and lifeboats.

2.   The Aleutian Enterprise was allowed to operate with an opening in its hull and watertight doors and hatches removed.

3.   The use of watertight doors prevented the ship from severely listing.

4.   At hearings earlier this summer, witnesses told the investigators the watertight door was frequently tied open.

5.   But the robot was unable to enter far inside to see whether all the automatic watertight doors were shut at the time of the sinking.