With deployments underwater typically running 90 days, life onboard a submarine is anything but normal.
Cramped quarters are the norm, and sailors must have the right technical know-how as well as determination to spend months underwater at a time.
To even be eligible to be a crewman aboard a submarine, applicants must pass a series of grueling tests, psychological evaluations, and intensive courses.
Of course, even once qualified, serving aboard a submarine is not a walk in the park.
America has 72 submarines in the fleet, including both attack submarines and fleet ballistic missile submarines called Boomers. Sailors typically deploy for 90 days in these war machines.
On all submarines, the first task after submersion is to ensure there are no leaks anywhere onboard.
Once fully submerged, life takes on an 18 hour schedule. This schedule is divided into three six-hour segments for sleeping, keeping watch, and spending free time.
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