328(1)An employer shall provide, and a diving supervisor shall ensure use of, a means of effective two-way communication between a diver and any person in control of the diving plant and equipment.
328(2)Where two-way voice communication is required, an employer shall provide
(a)
a standard of sound reproduction that enables the diver’s breathing to be heard clearly,
(b)
a suitable means of voice-unscrambling when the breathing mixture used significantly distorts sound transmission, and
(c)
a recording system for voice communication for depths exceeding 55 m.