Designs for underwater boats or submarines date back to the 1500s and ideas for underwater travel date back even further. However it was not until the 19th century that the first useful submarines began to appear.
 USS Flasher SS 249 High scoring Submarine for WW II |  USS Tusk SS 426 Guppy Type Submarine |  Forward Torpedo Room |  Loading Torpedos |
 Nuclear-Powered Submarine |  Royal Navy Submarine |
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