This Subsea intervention hazard identification checklist lists factors (and hazards) that are to some degree unique in the design and operation of subsea equipment.
This checklist can be reviewed when designing subsea equipment and/or planning subsea intervention related activities (be they onshore/offshore or subsea).
It only identifies hazards unique to subsea equipment, e.g. the particular hazards associated with pressure testing using gas rather than liquid. Other types of hazards are already well documented elsewhere.
IOGP Report 570