Why ship's insulation falls down during dry docking?

Dry docking entails bringing a vessel to dry land so that submerged portions of the hull are cleaned and inspected. This type of work is preventative as well as a regulatory requirement.

Drydocking refers to removing a ship or boat from the water using a drydock. An underwater dry dock is primarily used to inspect, repair, and maintain underwater parts.

As a common name for drydocks, graving docks are constructed on land near the waterfront using concrete, blocks, and lock gates. A dry dock is flooded when a ship is docked by opening the lock gate. A locked gate is put in its place and the dock is pumped dry, allowing the craft to gradually rest on blocks resting on the dock floor after it has been brought in and properly positioned. Floating docks, Syncrolift / Shiplift, and Slipways are other options for removing a ship from the water.