33 CFR §142.4

1. (a)Each holder of a lease or permit under the Act shall ensure that all places of employment within the lease area or within the area covered by the permit on the OCS are maintained in compliance with workplace safety and health regulations of this part and, in addition, free from recognized hazards.
2. (b)Persons responsible for actual operations, including owners, operators, contractors, and subcontractors, shall ensure that those operations subject to their control are conducted in compliance with workplace safety and health regulations of this part and, in addition, free from recognized hazards.
3. (c)“Recognized hazards”, in paragraphs (a) and (b) of this section, means conditions which are—
   1. (1)Generally known among persons in the affected industry as causing or likely to cause death or serious physical harm to persons exposed to those conditions; and
   2. (2)Routinely controlled in the affected industry.