air lock |
an airtight compartment in which the air pressure can be regulated, usu. situated between two areas that have different air pressures, as in underwater operations. [1/2 definitions] |
Aqua-Lung |
trademark for an underwater breathing device similar to a scuba. |
cablegram |
a telegraph message sent by underwater cable. |
caisson |
a watertight chamber used in constructing or repairing underwater structures. [1/2 definitions] |
crib |
a heavy underwater framework for supporting a structure such as a pier, dock, boathouse, or the like. [1/12 definitions] |
diving bell |
a large metal chamber used for underwater work and supplied with air under pressure equal to that of the surrounding water. |
diving suit |
any of various outfits worn by underwater divers, esp. a heavy, sealed garment with a detachable helmet that supplies pumped air. |
fin |
a rubber flipper worn by an underwater swimmer. [1/8 definitions] |
flipper |
one of a pair of flat, triangular, flexible foot coverings resembling a frog's foot and used for swimming or underwater diving. (See fin.) [1/3 definitions] |
frogman |
a swimmer equipped to work underwater, esp. one engaged in demolition of enemy ships in wartime. |
gribble |
any of several small saltwater crustaceans that bore into wood underwater, often causing great damage. |
ledge |
an underwater reef or ridge. [1/3 definitions] |
minelayer |
a naval vessel designed to lay explosive underwater mines. |
minesweeper |
a naval vessel used for destroying, removing, or deactivating underwater enemy mines. |
sandhog |
one who does excavation work in sandy, wet conditions, esp. a laborer working on the construction of an underwater tunnel. |
scuba |
a portable apparatus for underwater breathing, carried on the back (acronym for "self-contained underwater breathing apparatus"). [1/2 definitions] |
scuba diving |
the act of swimming underwater wearing scuba gear, as for recreation or scientific investigation. |
Sealab |
one of a number of exploratory underwater laboratories, developed by the U.S. Navy, where research in oceanography and marine biology is conducted. |
skin diving |
swimming in which the swimmer is equipped to move about quickly and easily underwater, as with flippers, face mask, scuba equipment, or the like. |
sonar |
a method for locating objects such as submarines underwater by means of transmitted and reflected sound waves (acronym for "sound navigation and ranging"). [1/2 definitions] |
sonic depth finder |
an instrument that uses sonar to measure underwater depths. |