Submarines， or "subs"， are boats that can<br >travel underwater， They are built mainly<br >for use by navies for attack and defense<br >in war. But they are also used for deep<br >sea exploration. In the future， they may<br >SSN SWIFTSURE CLASS<br >Rear stabilizing fin<br >Inner hull<br >be used as cargo vessels.<br > Submarines can dive hundre，<br >meters under the sea， where<br >crushing pressure of water is grea<br >for strength， the body， or hull， of sub~，<br >a double-layer design， with one<br >inside the other. The outer hull is sn~<br >and cigar-shaped to allow<br >.Engine room<br >Reactor contr~<br > Propeller shaft<br >Aft trim tank<br >Circulating water inlet<br >Nuclear reactor compartment<br >
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