One specific type of drydock. A fixed basin for dry-docking of ships, usually composed of stone
masonry, reinforced concrete, or steel sheet piling cells near a waterway; it can be closed off from
the waterway by a movable gate, usually a floating caisson. The vessel is floated in, the gates
closed, and the water pumped out. The vessel is set on blocks, and the basin during pumping
leaves the hull exposed for exterior painting or repairs.