Section 148(8) in The Navy (Pay And Allowances) Regulations, 1966
(8)When more than one diver is being supplied at the same time with air or gas mixture by the same control panel operator(a)the operator of the diver's control panel shall receive the one-fifth rate in respect of only one such diver;(b)the operator of the submerged decompression chamber control panel shall receive the one-fifth rate either in respect of an attendant in the submerged decompression chamber, or in respect of the diver in the submerged decompression chamber, but not for both concurrently;(c)the operator of the main decompression chamber control panel, shall receive the one-fifth rate in respect of only one diver in the chamber, and not in respect of any attendant in the chamber.