ANS:C - Floating dock

The chamber you are referring to is called a dry dock.

A dry dock is a narrow basin or vessel that can be flooded with water to allow a ship or vessel to be floated in and then drained to allow the ship to be lifted out of the water and onto a platform.

The buoyancy principle is used to lift the ship when the water is drained out of the dry dock, and the ship's weight is supported by the platform. This allows for maintenance, repairs, and inspections to be performed on the ship's hull and other parts that would otherwise be submerged in water.