Incident Report

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Incident Report 2020-05-01T16:26:00+00:00

Drysuit inversions x 4

Incident Date

1970-01-01

Incident Description

729306061 Diver A was conducting a traverse from Elm Hole to Daren Cilau when at 350 m from base he became inverted and stuck to the roof by his feet. The line was pulled on and used to orient the diver. No ankle weights were worn and the diver was using his drysuit underground for only the second time. 1020301261 Diver B was diving into Daren Cilau from Pwll-y-Cwm carrying a chest mounted bag of equipment. The diver lost trim and ended up on the roof of the passage. Several cuts were made in the divers drysuit to dump air and the tackle bag was dropped. The diver fell back onto the line and made a speedy if damp exit. A following diver collected the bag and returned to base to check on B. 1062982861 Diver A was conducting a long loop in a flooded mine. Four large cylinders were carried in addition to a scooter. On return to base from completing the circuit the diver handed off his scooter to another diver. This caused the diver to float up into the roof of the large passage past his stop depth and become pinned to the roof by his feet. Normal trim was recovered with difficulty. 1049677261 Diver C was doing a stage dive in a cave in Florida using sidemounts. No additional bouyancy was carried and the diver became inverted whilst dropping off a stage tank. Fortunately the passage was low and enabled the diver to become upright again easily.

Lessons Learned

Inexperience can cause drysuit inversions. Ankle weights or weights on fins can be used to avoid this as can gaiters. Incidents can be caused particularly when the diver is carrying excess equipment. When dropping off negatively bouyant equipment (stages/scooters) always reduce bouyancy ahead of removing equipment.
Factors
Line Management Unknown
Gas Management Unknown
Equipment Management Major
Equipment Failure Unknown
Training Minor
Medical Negligible
Planning Negligible
Procedural Error Major
Cave Environment Negligible
Weather Negligible
Other Factor Negligible