Water surface searches are procedures carried out on or over the surface of a body of water with the purpose of finding lost vessels, persons, or floating...

objects in a specified search area under water Water surface searches, procedures carried out on or over the surface of a body of water with the purpose of...

Surface-supplied diving equipment (SSDE) is the equipment required for surface-supplied diving. The essential aspect of surface-supplied diving is that...

A surface search radar, sometimes more accurately known as a sea-surface search radar or naval surveillance radar, is a type of military radar intended...

underwater hockey and underwater rugby, and as part of water-based searches conducted by search and rescue teams. Essential equipment includes the snorkel...

Underwater searches are procedures to find a known or suspected target object or objects in a specified search area under water. They may be carried out...

flow through – influence them. The two basic types of currents – surface and deep-water currents – help define the character and flow of ocean waters across...

occupation, or for recreation, where the practitioner submerges below the surface of the water or other liquid for a period which may range between seconds to the...

high-pressure water spray to remove loose paint, mold, grime, dust, mud, and dirt from surfaces and objects such as buildings, vehicles and concrete surfaces. The...

recreational search and recovery are enormously different, the basic premise remains the same in each case. Underwater searches, much like above water searches, are...

wind-generated water wave, is a surface wave that occurs on the free surface of bodies of water as a result of the wind blowing over the water's surface. The contact...

occupation, or for recreation, where the practitioner submerges below the surface of the water or other liquid for a period which may range between seconds to the...

occupation, or for recreation, where the practitioner submerges below the surface of the water or other liquid for a period which may range between seconds to the...

are obtained through confined water training (pools or relatively shallow water) and performance evaluations in open water. PADI courses target four progressive...

maximum drilling depth of 6,100 metres (20,000 ft), and it could operate at a water depth of 460 metres (1,500 ft). As a drilling rig, Byford Dolphin was equipped...

enabled by Earth being a water world, the only one in the Solar System sustaining liquid surface water. Almost all of Earth's water is contained in its global...

for almost any large body of water; it is a return flow compensating for the onshore-directed average transport of water by the waves in the zone above...

In-water cleaning, also known as in-water surface cleaning, is a collection of methods for removing unwanted material in-situ from the underwater surface...

been pioneered; open-circuit surface supplied equipment where the diver's exhaled gas is vented directly into the water, and closed-circuit breathing...

diving is the human practice of voluntarily descending below the surface of the water to interact with the surroundings, for various recreational or occupational...

acceleration of water towards the sublunar and antipodal points, building up water until the pressure gradient force from the bulging sea surface exactly balances...

diving, as a human activity, is the practice of descending below the water's surface to interact with the environment. It is also often referred to as diving...

diver to the surface support, carries the hot water from a heater at the surface down to the suit. The diver controls the flow rate of the water from a valve...

operated vehicles and autonomous underwater vehicles Searches by surface vessels Searches by aircraft Searches from the shore Basic ropework, knots and splices...

tropics, warming the surface layer, making it less dense than subsurface layers. The warmer water is separated from deeper, cooler water by a stable thermocline...

ocean's surface, which heats during the day and cools at night as heat energy is lost to space by radiation. Waves mix the water near the surface layer...

distances (ranging), communicate with or detect objects on or under the surface of the water, such as other vessels. "Sonar" can refer to one of two types of...

population of algae in freshwater or marine water systems. It is often recognized by the discoloration in the water from the algae's pigments. The term algae...

of water is steam or water vapor. Water covers about 71% of the Earth's surface, with seas and oceans making up most of the water volume (about 96.5%)...

divers are transported vertically through the water in a closed bell and transferred under pressure into a surface decompression chamber for decompression,...