Section 149.338 - What are the requirements for immersion suits?(a) Each unmanned deepwater port located north of 32 degrees North latitude must comply with the immersion suit requirements applicable to mobile offshore drilling units under 46 CFR 108.580 , and immersion suits must be approved under approval series 160.171. Except as under paragraph (b) of this section, the immersion suits need be on the deepwater port only when persons are on board.(b) If an attending vessel is moored to the unmanned deepwater port, the suits may be stowed on the vessel, instead of on the deepwater port.