dry dock

• structure that can be drained of water and raised in order to allow access to all parts of a ship's hull (for repairs, maintenance, etc.)
a dry dock is a place in a harbour from which water can be removed after a ship has entered it, so that the ship can be repaired or finished.
place in a dry dock; go into a dry dock; pull a ship into a drydock
structure that can be drained of water and raised in order to allow access to all parts of a ship's hull (for repairs, maintenance, etc.)