Incident Report

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

Cylinder jammed in fissure

Incident Date


Incident Description

Sump 1 has a restriction where the diver passes over two adjacent large slabs. (The slot in the floor between them was previously enlarged by jacking the two large slabs apart slightly.) On the return from a line laying dive at the end of the cave (i.e. with cylinders almost down to two thirds depleted) my left hand cylinder was in this slot whilst negotiating the restriction and became jammed. It would not move forwards or backwards. Whilst working on unclipping the cylinder it did eventually come free, before having to consider cutting the cylinder attachment point. (This is the second time I've had a cylinder jammed in a floor crack; exactly the same thing happened several years ago in the Grayrigg Cave sump.)

Lessons Learned

This reinforced the conviction that attachments between cylinders and harness MUST include a cuttable component (i.e. not be all metal).
Line Management Unknown
Gas Management Unknown
Equipment Management Major
Equipment Failure Unknown
Training Unknown
Medical Unknown
Planning Unknown
Procedural Error Unknown
Cave Environment Major
Weather Unknown
Other Factor Unknown