IMCA draws lessons learned from an incident where an unsecured bailout set slipped from its stowed position inside a diving bell and fell.

What went wrong?

• The bailout cylinder was not correctly attached to the seat cradle (carabiner and elastic strap).

• Post-dive securing checks following bell runs were not completed.

• The process for securing and verifying bailout cylinders was not formally described or included in checklists.

• Divers had become desensitised to the hazard of dropped objects within the bell environment. 

Also noted as part of the investigation was:

• Bailouts were being suspended using S-hooks rather than carabiners, increasing the likelihood of dislodgement in the confined space of the diving bell. 

Actions taken in this case

• Developed a formal work instruction/checklist for securing and verifying bailout cylinders.

• Replaced all S-hooks in the diving system with carabiners or positive locking brackets.

• Updated risk assessments and JHAs to include hazards related to dropped objects inside the bell.

• Re-briefed and retrained all bellmen and divers on proper securing methods.

• Introduced a cross-check process requiring both incoming and outgoing bellmen to confirm that all bailouts are secured before and after each dive.