During planning for upcoming works in a restricted space the question of emergency response for a worker in a 5m deep tank has been raised. Primary access/egress is via a secure ladder.
Emergency response method suggested was tether working to secondary hook of a crane (100t) and in the event of an emergency use the crane to recover the person. I did not believe this to be a safe method of recover. A subcontractor worker states this is commonly used throughout New Zealand.
Has anyone ever used or approved of this before ?