Ship used as a floating base for professional diving projects
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CSV Skandi Singapore departing Fremantle, Australia
A diving support vessel is a ship that is used as a floating base for professional diving projects. Basic requirements are the ability to keep station accurately and reliably throughout a diving operation, often in close proximity to drilling or production platforms, for positioning to degrade slowly enough in deteriorating conditions to recover divers without excessive risk, and to carry the necessary support equipment for the mode of diving to be used.
Recent offshore diving support vessels tend to be dynamically positioned (DP) and double as remotely operated underwater vehicle (ROV) support vessels, and also be capable of supporting seismic survey operations and cable-laying operations. DP makes a wider range of operations possible, but the platform presents some inherent hazards, particularly the thrusters, making launch and recovery by diving bell widespread. They may use a moonpool to shelter the position where the bell or ROV enters and exits the water, and the launch and recovery system may also use a bell cursor to constrain relative movement through the splash zone, and heave compensation to minimise depth variation of the bell during the dive. Accommodations must be provided for the teams supporting whichever functions the vessel is contracted for.
DSVs for inshore operations tend to be much smaller, and may operate while moored for shallow work. Live-boating operations are considered unacceptably hazardous for surface supplied diving unless a stage or bell is used to keep the divers' umbilicals clear of the vessel's thrusters
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