Incident Report

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

Failed Dive Computer

Incident Date


Incident Description

I dived for about ten minutes to a distance of about 50m - upstream progress in Ilam Main Rising is slow. When I looked at my computer which had been reading normally it informed me that I was at -29.2m and had 92 minutes decompression. As this was patent balderdash and I had a dive-timer decompression tables and 7.7L cylinders that would not permit a dive of sufficient depth/duration to require decompression at a site which I know well I continued. On my return I did an extended safety stop and surfaced with the computer still claiming that I was at -29.2m and had 92 minutes decompression; it did not give an alarm signal.

Lessons Learned

Redundancy of instruments can be as important as of cylinders/valves. Familiarity with a dive sitewhether acquired from previous dives or by other meanshelps dealing with some incidents. A less obvious fault with the computer might not have been noticed and could have led a a more serious outcome.
Line Management Negligible
Gas Management Negligible
Equipment Management Negligible
Equipment Failure Major
Training Negligible
Medical Negligible
Planning Negligible
Procedural Error Negligible
Cave Environment Negligible
Weather Negligible
Other Factor