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| | Submarine - Art History Online Reference and Guide |
 | | Modern attack submarines, such as in the US Navy are known as fast attack subs and generally operate in the hunter-killer role, and large subs carrying strategic nuclear missiles are known as boomers. |
 | | Royal Navy submarines classes, including ballistic missile submarines, are letter-based; thus, all boats of the Swiftsure class begin with the letter S and the Trafalgars, the letter T. Though this has been the way with all Royal Navy submarines, they were originally designated alphanumerically, such as HMS A1 of the A-class of 1903. |
 | | The first submarine, and first military submarine was the Turtle, a hand-powered spherical contraption designed by the American David Bushnell that was designed to accommodate a single man. It was the first verified submarine, capable of independent underwater operation and movement, and the first to use screws for propulsion. |
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