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Ballast tank

3:06

Inspecting The Inside Of A Cargo Ship's Water Ballast Tank | Life At Sea

3:24

How does a submarine sink and rise ? Animation

3:07

What is Ballast Water Management System (BWMS)

1:54

Main ballast tank blow

2:11

How Do Submarines Dive and Surface?

A ballast tank is a compartment within a boat, ship or other floating structure that holds water, which is used as ballast to provide stability for a vessel. Using water in a tank provides easier weight adjustment than the stone or iron ballast used in older vessels. It also makes it easy for the crew to reduce a vessel's draft when they enter shallower water, by temporarily pumping out ballast. Airships use ballast tanks for similar advantages.
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