A drydock is a basin that can be flooded to let a vessel in, then drained so the ship rests on blocks, exposing the hull for inspection, maintenance and repair. Class rules require commercial vessels to be drydocked periodically — typically twice in five years — for hull surveys, coating renewal and propeller or rudder work.
The availability of drydocks and repair yards is a differentiating capability between ports, recorded for instance in the World Port Index facility data.
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