What is the lowermost deck of the ship?

The lowermost deck of a ship is known as the bilge deck or bottom deck. It is the lowest level in the hull of the ship and is located below the waterline. The bilge deck provides stability and support to the ship, as it houses the ballast and the keel, which help to keep the ship balanced and upright.

The bilge deck is usually the least desirable area on the ship as it is dark, cramped, and damp. It is primarily used for storage of equipment, machinery, and fuel tanks. However, in some smaller vessels, it may be used for crew accommodations or cargo storage.

The bilge deck is also important for the safety of the ship as it houses the bilge pumps, which are used to remove any water that may have entered the ship's hull due to leaks or flooding. Additionally, the bilge deck is inspected regularly for any damage or corrosion that may weaken the hull and compromise the ship's integrity.