Ok, the first fly in your ointment is the ad posted by Thalassamania keeps referring to "Divemaster"s. That is a recreational SCUBA certification (and only one certification agency uses the term "divemaster"). If, as written previously, any diver performs maintenance work, and or the dive is considered commercial diving work, you are in violation of both OSHA regulations and the standards of the SCUBA certifying agency.
If you refernce the letter to the ADC (
Association of Diving Contractors International ) and read the whole OSHA regulations, you will find that recreational SCUBA certs. do not qualify a diver to do Commercial Diving work. Have your first dive accident where the diver in the water is holding a wrench, and you will find out how this is being interpeted by the insurance industry and OSHA.