Very few people have ever had the opportunity to be a submarine crew member. And those who did enter a submersible recently, paying 250,000 dollars for a visit to the Titanic, died in the endeavor.

Crazy. I'm David Marquet, former nuclear submarine commander, and I'm gonna watch some submarine clips, and we're gonna rate them for realism. "The Hunt for Red October" (1990) Officer ...

However, things change when one the men is in a submarine trapped beneath the ocean and the other, a diver, is sent down on a rescue mission.

After losing a submarine and fifty crew in a battle with a German ship during WWII, a Royal Navy officer gets a second chance in a daring raid with midget subs.