The mast from a blast-hole drill rig undergoing maintenance was removed and placed horizontally on stands. The hydraulics had been disconnected from the hydraulically operated break out (HOBO) wrench actuating cylinder, and the maintenance fitter was swinging the HOBO wrench out of the way to work on the base assembly.
Repositioning himself to release the lifting chain, the fitter slipped and grabbed the HOBO wrench, pulling it over-centre and causing it to swing downwards, pinning his lower left leg between the wrench and the carousel resulting in serious injury, as depicted in the re-enactment photo below. (Source Qld Govt – Department of Natural Resources and Mines)
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