Episode 99 of "JAG"
s05e14 Cabin Pressure
Title: Cabin Pressure
Original Air Date: 02/01/2000 on CBS
Plot Outline:
Harm is trapped below deck on a sinking ship with a sailer, who has been accused of murder, and a guard. Some rescue equipment collapses, blocking the only escape route. As water begins to fill the room, the three men are certain that the situation is hopeless.