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Six types of diving crafts

Diving beli

A bell-shaped craft, open atthe bottom, which is lowered into the water at the end of a cable.

Bathysphere

A hollow bali big enough for up to three people to fit inside. Also attached to the end of a cable.

Bathyscaphe

A hollow bali attached to a float. Able to dive and surface by itself.

Midget submarine

A smali, manned diving craft, often military, that can make short dives.

Submersible

A smali civilian diving craft, usually launched from a mothership.

Submarine

A large, mainly military, diving craft that can operate underwater for long periods of time.

Submarines

Submarines navigate and avoid obstacles by using a system called sonar. This involves sending out sound waves that bounce back from nearby objects and locate them on a screen.

A submarine can submerge in less than a minutę.

Submarines travel faster underwater than on the surface.

In calm, elear water, a submarine can be spotted from the air down to a depth of 98 ft (30 m).

A modern submarine is madę from morę than 7 million parts.

A submarine’s “test depth” is the deepest that it is allowed to dive during peace-time.

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The “never-exceed depth” is the deepest that a submarine is allowed to go during war.

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_m The “design depth” t^MBBis the maximum depth calculated by a submarine’s designers.

The “crush depth” is •the depth at which a submarine’s hull would be sguashed by water pressure.

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subs in the world Tt weigh up to 24,500 t< °n the surface and et ^more than 160 crev d^em bers.

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