Incident Report

2022-04-29Sump 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.)This reinforced the conviction that attachments between cylinders and harness MUST include a cuttable component (i.e. not be all metal).