I have worked with Rockwater (they became part of what is now Subsea7) and other commercial diving companies on saturation diving jobs, mainly in the North Sea but their company processes are standard and global. My involvement has been on the client side, defining the overall work scope and outcomes.
For reasons of safety and efficiency, every saturation diving job is thoroughly planned and executed via a series of procedures / task plans which often run to 100+ pages of detailed instructions, drawings, and risk assessments. Especially so when entry to confined spaces is required. A typical diving support vessel has a crew numbering over one hundred (the Rockwater SEMI I involved in the Estonia survey had a capacity of 110 persons) as well as the same again in onshore support staff.
The point being, the idea that the work is being performed at the whim of the diver or dive supervisor, and that there was some sort of cover-up in which all these people were complicit, is frankly bonkers.
Just my 2p-worth.