List of Diving Hazards and Precautions - Hazards of The Dive Task and Special Equipment

Hazards of The Dive Task and Special Equipment

Hazards specific to special purpose underwater tools should be described in the article for the tool, but may be added here.

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Hazard Consequences Cause Avoidance and prevention
Carrying tools (in general) in midwater and at the surface. Buoyancy problems due to weight of tools - Inability to achieve neutral buoyancy for ascent and positive buoyancy on surface.
  • Increased risk of drowning.
  • difficulty in controlling ascent rate.
  • Risk of losing tools if they must be abandoned.
 Carrying an excessive weight of tools.
  • Tools may be lifted and lowered to the worksite using a rope.
  • Tools may be returned to the surface using a lift bag and a surface marker buoy in case the bag sinks.
  • Surface supplied divers may be pulled up by the tender or lifted on the diving stage or bell.
Lifting bags Uncontrolled ascent of diver. Snagging on lift bag as it begins ascent, and being dragged up with it. Precautions can be taken to reduce risk if diver snagging on bag or load. These include use of a rigid extension pipe to fill parachute style bags, allowing the diver to remain at a safe distance.
Loss of breathing gas. Using up breathing air to fill lift bag.
  • Use of an independent air cylinder dedicated to bag filling, rather than filling from the breathing gas cylinder(s).
  • Use of surface supplied air to fill bags.
  • Impact of falling objects.
  • Loss of lift bag and cargo.
  • Damage to lift bag, cargo or other equipment.
 Runaway lift(bag):
  • Lift bag broaching at surface or leaking, losing gas and sinking on top of divers.
  • Lift bag broaching at surface or leaking and sinking at unknown position.
  • Lift bag surfacing under vessel or structure and snagging on projection which punctures bag, or fouling propeller or rudder etc.
  • Poor rigging causing damage to bag or cargo.
  • Marking lift bag or load with a surface marker buoy before lifting.
  • Ensuring that lift takes place when surface vessels and structures are clear of the area.
  • Buoyant assisted lifting, where the lift bag is insufficient volume to lift the load without assistance from a crane or winch.
  • Staged lifting, where the load is lifted in stages, a short distance at a time.
  • Adequate training and use of suitable rigging equipment and lift bag size and style. Attachment to suitable lift points, taking trim and stability into account.


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