Reference Terms
from Wikipedia, the free encyclopedia


A submarine is a specialized watercraft that can operate underwater.

Most major navies use submarines.

Submarines are also used for marine and freshwater science and for work at depths too great for human divers.

Note:   The above text is excerpted from the Wikipedia article "Submarine", which has been released under the GNU Free Documentation License.
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Matter & Energy News
November 29, 2015

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updated 12:56 pm ET