There are demands on the diving industry to perform an increasing range of tasks on subsea facilities. Unfortunately incidents have occurred during such operations, but from these a great deal of knowledge has been gained.

This guidance has been written to assist both operators and contractors in reducing the risks to divers when executing such tasks. Typically, these tasks involve wellhead intervention work, flow base installation, umbilical tie-in, control module installation/replacement, and also general inspection, repair and maintenance activities. When planning such tasks, hazard identification and work control are critical, especially when commissioning or when concurrent production activities are ongoing.