An in-water survey vessel is a specialized craft equipped with advanced instrumentation and facilities to conduct inspections and surveys of ships and marine structures while they remain afloat. These vessels are equipped with sonar systems, underwater cameras, and other sensing technologies to collect precise data on a ship's hull condition, propeller efficiency, and other critical parameters without the need for dry-docking. In-water survey vessels play a crucial role in maintaining the operational readiness and safety of maritime fleets by enabling regular inspections and assessments in a cost-effective and efficient manner.