5. Mr. Monk Is Underwater

Monk and Natalie are asked by one of Mitch's old friends, Steven Albright ( Casper Van Dien ), to investigate the suspicious death of a second-in-command who apparently shot himself in a locked room on a Navy submarine prior to a surprise drill. But Monk is terrified when they end up stuck on the submarine in the middle of a new exercise, all the while hallucinating that Dr. Bell is with them. He becomes suspicious of the submarine's commander ( William Atherton ), but cannot prove a thing due to being trapped in a ballast tank that is filling with water.