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The U.S. Navy's Alvin (DSV-2) is not a mini-submarine; it is a submersible.

The technical difference between submarines and submersibles is that submersibles like Alvin require support vessels (surface or submarines) to transport them to their site of operations, launch / recover them, and replenish power, water, air, etc. after each use. They are also limited in space and air supply, which curtails their submerged operational time. These multiple factors are whey they are limited in their operational scope.

Submarines are self-supporting units; while they may require support for repair and replenishment of crew needs (e.g., food), they do not require the type of support that submersibles do.

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14y ago

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