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The classic form of drydock, properly known as graving dock, is a narrow basin, usually made of earthen berms and concrete, closed by gates or by a caisson, into which a vessel may be floated and the water pumped out, leaving the vessel supported on blocks. The keel blocks as well as the bilge block are placed on the floor of the dock in accordance with the "docking plan" of the ship.
Graving dock or dry dock is the mechanical shop and the body shop of the ships after being chained and pulled out of water.
A dry dock where the hulls of ships are repaired and maintained.
