A submarine is a watercraft capable of independent operation underwater. It differs from a submersible, which has more limited underwater capability. Wikipedia
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The submarine community is a small force which delivers a major impact and provides unique capabilities to operational commanders. As the maritime security ...
a large sandwich on a long split roll with any of a variety of fillings (such as meatballs or cold cuts, cheese, lettuce, and tomato).
Submarine definition: a vessel that can be submerged and navigated under water, usually built for warfare and armed with torpedoes or guided missiles.