Underwater Hull or Underwater Ship refers to the part of a ship that is submerged below the waterline:

Definition: The portion of the ship’s hull that is below the surface of the water.

Components: Includes the keel, bottom plating, bilge, and other structural elements that provide buoyancy and stability.

Importance:

Hydrodynamics: The design of the underwater hull is crucial for the ship’s hydrodynamic performance, affecting speed, fuel efficiency, and maneuverability.

Maintenance: Regular inspection and maintenance are required to prevent issues like corrosion, biofouling (accumulation of marine organisms), and structural damage.

Safety: Ensures the vessel’s seaworthiness and safety by maintaining its structural integrity and buoyancy.