What does "underwater survey" entail?

"Underwater survey" fundamentally involves the inspection of a vessel's hull and underwater equipment. This process is essential for ensuring the structural integrity and safety of the vessel while it is submerged. It typically includes examining the condition of the hull, checking for signs of corrosion, checking for damages or marine growth, and assessing the functionality of any underwater machinery or mechanisms.

By conducting thorough underwater inspections, potential issues can be identified and rectified before they evolve into more significant problems, which might affect the vessel's performance or lead to costly repairs. Such inspections are critical for maintaining compliance with regulatory standards and ensuring the overall safety of maritime operations.

The other options, while related to activities that may occur underwater, do not accurately define the specific purpose and scope of an underwater survey in the context of vessel maintenance and safety.