Definitions for underwaterˈʌn dərˈwɔ tər, -ˈwɒt ər
This page provides all possible meanings and translations of the word underwater
submerged, submersed, underwater(adj)
beneath the surface of the water
subaqueous, subaquatic, submerged, submersed, underwater(adj)
growing or remaining under water
"viewing subaqueous fauna from a glass-bottomed boat"; "submerged leaves"
underlying water or body of water, for example in an aquifer or the deep ocean
A type of lure which lies beneath the water surface.
to water or irrigate insufficiently
beneath the surface of the water, or of or pertaining to the region beneath the water surface
beneath the water line of a vessel
having negative equity; owing more on an asset than its market value
We've been underwater on our mortgage ever since the housing crash.
Underwater is a term describing the realm below the surface of water where the water exists in a natural feature such as an ocean, sea, lake, pond, or river. Three quarters of the planet Earth is covered by water. A majority of the planet's solid surface is abyssal plain, at depths between 4,000 and 5,500 metres below the surface of the oceans. The solid surface location on the planet closest to the centre of the orb is the Challenger Deep, located in the Mariana Trench at a depth of 10,924 metres. Although a number of human activities are conducted underwater—such as research, scuba diving for work or recreation, or even underwater warfare with submarines, this very extensive environment on planet Earth is hostile to humans in many ways and therefore little explored. But it can be explored by sonar, or more directly via manned or autonomous submersibles. The ocean floors have been surveyed via sonar to at least a coarse resolution; particularly-strategic areas have been mapped in detail, in the name of detecting enemy submarines, or aiding friendly ones, though the resulting maps may still be classified. An immediate obstacle to human activity under water is the fact that human lungs cannot naturally function in this environment. Unlike the gills of fish, human lungs are adapted to the exchange of gases at atmospheric pressure, not liquids. Aside from simply having insufficient musculature to rapidly move water in and out of the lungs, a more significant problem for all air-breathing animals, such as mammals and birds, is that water contains so little dissolved oxygen compared with atmospheric air. Air is around 21% O2; water typically is less than 0.001% dissolved oxygen.
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