underwater

[uhn-der-waw-ter, -wot-er]
adjective
1.
existing or occurring under water.
2.
designed to be used under water.
3.
located below a ship's waterline.
adverb
4.
beneath the water: to travel underwater.
noun
5.
the water beneath the surface: cold currents in the underwater.
6.
underwaters, the depths, as of a sea, lake, etc.

Origin:
1620–30; under- + water

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
underwater (ˈʌndəˈwɔːtə)
 
adj
1.  being, occurring, or going under the surface of the water, esp the sea: underwater exploration
2.  nautical below the water line of a vessel
3.  (of a stock option or other asset) having a market value below its purchase value
 
adv
4.  beneath the surface of the water

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Etymonline
Word Origin & History

underwater
1627, from under + water.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
When underwater, the animals pushed water past their gills while simultaneously
  pushing the glottis down.
Water spiders can safely stay underwater for a day or more at a time, longer
  than previously thought.
Indeed, it is able to displace water and thus adhere to surfaces even
  underwater.
Farmers in many flood plains plant crops that grow underwater, such as deep
  water aman rice or jute.
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