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A "Hatch" is the naval term for a door .
A submarine hatch can be opened fairly easily if the submarine is filled with water because the water pressure on each side of the hatch is equalized.
I opened the hatch on the submarine. I watched the egg hatch. The thieves got together to hatch a plan.
It can be. An escape hatch was installed in the submarine.
The submarine hatch forms a hermetic seal.
"Escape" on the escape hatch on the submarine
At first, water was pressing on the hatch from one side. When water was pressing equally on both sides, it was easy to open the hatch. Remember this if your car falls into the harbour.
To enter or exit (or escape from) a submarine you must locate a hatch in the pressure hull. There is usually a hatch near the bow, the stern, and amidships, and each is set atop a feature called an escape trunk. The escape trunk is a small "compartment" with an inner hatch, and it is set up to provide a way to "lock out" a group of submariners that is making an emergency exit under water. A torpedo tube might also be used to escape.
Submariners.
She did her work under the sea in a submarine
On modern submarines, there are typically 4 primary access hatches - 1 in the bow, 1 in the stern, one on the bridge (at the top of the sail, or fairwater), and one hatch amidships. On most Submarines the center hatch (and most frequently used in port) is called the Weapons Shipping Hatch. This is because it is the only hatch which is at a 45 degree angle, as its primary function is for loading torpedoes and other weapons into the Torpedo Room. The fore and aft access hatches on U.S. boats are also entrance and exits for the 2 Escape Trunks, used for crew escape, or for certain configured boats, SEAL delivery. All hatches have an inner and outer hatch to further ensure the inner pressure hull is not comprimised should an outer hatch seal fail for any reason. Hatches also have a safety latch mechanism, that is to keep the hatch from being blown open by pressure in the boat when the hatch is opened after the boat has been submerged for some time. Such pressure can literally eject the opening crewman out of the hatchway. The latch provides a slower release, as well as a safety mechanism to keep the crewmember safe.
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