Yikes!

Navy finds lax behavior aboard sub in collision - USATODAY.com: "The crew aboard a U.S. submarine made dozens of errors before the vessel collided with an American warship in the Persian Gulf, an accident that exposed lax leaders who tolerated sleeping, slouching and a radio room rigged with music speakers, a Navy review found.
[. . . .]
The submarine had five known "sleepers," or sailors who would routinely nod off on watch, but no disciplinary action was taken, the report states. Two of the five sailors were working during the collision, but investigators found no evidence they were asleep.

During the hour before the collision, investigators say, sonar operators in charge of monitoring nearby ships were chatting informally; the supervisor left his station; the navigator was taking an exam while listening to his iPod; and the officer in command did not check the periscope."