| Hazard | Who | Risk Evaluation | Controls | Immediate measures to deal with consequences if risk does occur |
| Weather unsafe for diving | All | Low | Check inshore weather forecast at 6:00 pm on night before dive. Cancel is conditions adverse. | Cancel dive before divers in water. Return to port as quickly as possible. Keep good lookout for surfacing divers if visibility becomes compromised. |
Fog
| All | Medium | Check inshore weather forecast at 6:00 pm on night before dive. Cancel is conditions adverse. | Keep extra lookout for DSMBs. Look on AIS for divers equipped with beacons. Use radar if necessary to return to port. |
| Another vessel comes close to dive site | Divers | Medium | Fly Alpha divers down flag. Call on radio. | Try to get other boat to move. Keep a good watch for surfacing divers. |
Lost Diver
| Diver | High | Dive brief to include maximum dive time and method of diver recovery. Ensure all divers have a DSMB. | Call coastguards. Start search after all other divers recovered. Brief all crew to keep a good lookout. Use binoculars to improve vision. |
Diver Trips on Deck
| Diver | Medium | Safety brief to include handholds and trip hazards on boat. Cancel dive if conditions adverse. Keep divers BLS skills current. | If diver injured then asses injuries and perform first aid as necessary. Make a PAN or Mayday call if required. Prevent casualty entering the water if injured. |
| Fire on Board | All | Medium | Safety brief to include location of the fire extinguishers. Ensure fire extinguishers are in date. | Call coast guards and abandon ship if necessary. Call Mayday. |
| Serenity sinking | All | Low | Safety brief to include evacuation procedure including position of emergency grab bag, EPIRB and liferaft. Ensure liferaft is in service. | Call Mayday. Deploy liferaft and trigger EPIRB. Any divers over capacity of liferaft to don diving suit and hold onto raft. |
| Diver has DCI or suspected DCI. | Diver and Buddy | Medium | Safety brief to include location of emergency oxygen. Check oxygen cylinder pressure. Keep crew BLS current. | Call Mayday. Administer oxygen and first aid. Keep record of incident. Report to BSAC |
| Diver injury in water including drowning | Diver and buddy | High | Dive brief to include recovery procedure for injured or unconscious diver. Keep crew BLS current. | Call Mayday. Administer oxygen and first aid. Keep record of incident. Report to BSAC |
Diver has hypothermia
| Diver | Low | Keep foil blanket in the first aid kit. | Bring diver in wheelhouse and warm up. Issue Mayday or PAN as appropriate. Use foil blanket from first aid kit. |
| Diver has heat stroke | Diver | High | Keep plenty of fluids for re-hydration. Keep suntan crème in first aid kit. | Keep diver out of sun and cool off. Issue Mayday or PAN if appropriate. |
Entanglement
| All | Low | Safety brief to include position of cutting tools. Ensure grab bag contains a knife. | Cut wire/rope. Call Mayday if not possible |
| Diver trips on Deck | All | Medium | Safety brief to include trip hazards. Ensure Serenity has sufficient hand holds. Crew to help divers between benches and lift. | Administer first aid. Return to port and call PAN or Mayday if appropriate. |
Man Overboard
| Diver | Medium | All crew to wear buoyancy devices. Safety brief to include man overboard procedure. | Everyone on-board to keep pointing at man overboard. Retrace boat path to recover man overboard via the dive lift or ladder. Call PAN or Mayday if appropriate. |
| Diver influenced by drugs or alcohol | Diver | Medium | Dive manager to assess ability of diver to complete dive. Cox has final veto. | Recover diver from water as soon as possible. |
Engine Failure
| All | Low | Keep engine maintained. Boat fitted with twin outboards. | Return to port on one engine. Call PAN or Mayday of required. |
| Electrical failure | All | Low | Serenity has two electrical systems, one for each engine. Use navigation equipment connected to the working electrical supply. | Return to port using working navigation equipment. Call PAN or Mayday if required. |
| Radio Failure | All | Low | Use alternate radio or handheld radio in the grab bag | Switch radio in use |
| Dive Lift Failure | Diver | Low | Keep dive lift and ladder maintained. | Use Ladder to recover divers |
| Diver Separation | Diver | Medium | Divers to dive in buddy pairs | Treat separated divers as lost diver until buddy surfaces. |
| Diver has problems under water | Diver | Medium | Diver encouraged to carry yellow SMB to indicate problems. | Try to help diver recovery. |
| Injury from falling cylinders | All | Medium | All equipment to be tied to benches before leaving the harbour. Spare cylinders may be stored under the benches. | Administer first aid. Return to port and call PAN or Mayday if appropriate. |
| Seasickness | All | Low | Check seasickness tablets are in first aid kit. | Keep casualty hydrated. |