S-2.1, r. 13 - Regulation respecting occupational health and safety
312.78. Diving equipment: In addition to the equipment referred to in section 312.36, except paragraph 4, the following equipment must be worn:
(1) a surface-supply diving helmet suitable for working in a contaminated environment; and
(2) a diving suit, made of non-absorbing material, resistant to the contaminants present, to which the diving helmet is attached by a positive seal and lock device.