the casualty buoyant on the surface – Ensuring that the diver does not sink before they can be removed from the water. Carrying out artificial ventilation in the water – Towing the casualty – Getting the casualty to a place where they can be taken out of the water Surface-supplied diver rescue procedures: Assisting a trapped diver – The diver may be unable to release themself from the entrapment. Umbilical changeout – Swapping a problematic umbilical for a replacement under water Rescue of the working diver – Getting the disabled working diver to a place of relative safety Rescue of an incapacitated diver – Getting the diver to the surface Rescue of an unconscious diver – Getting an unconscious surface supplied diver to the surface Recovery of diver to the bell – Getting an incapacitated diver back to the bell where a relatively secure breathing gas supply is available and some first aid is possible, and the first stage of recovery to the surface. Rescue of divers from a disabled closed bell – Through-water transfer to another closed bell Lost bell procedures – Locating and lifting a closed bell when the lifting cables and umbilical have been severed References Underwater diving safety