Dry docks are one of the essential components of ship building and maintenance. They are essentially concrete canals attached to waterways after a certain amount of construction is complete. Many shipyards will begin assembling the pieces inside an unflooded dry dock when the boat is ready for launch water is pumped into the canal until it becomes even with the water levels outside.
Once this happens the gate is open and the ship sails away, it takes place when a boat needs repair or repainting. Once sailing into the flooded dock powerful pumps slowly remove the water so that the whole of the ship can be accessed more easily.
Docking differs slightly depending on the ship’s size and the shipyard’s capabilities.