S-2.1, r. 13 - Regulation respecting occupational health and safety

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312.22. Communication system by line signals: Except in the case of a buddy dive in accordance with section 312.20, a 2-way communication system by line signals must be established for each dive so that
(1)  a diver may immediately obtain help from the dive team members on the surface, if needed; and
(2)  the dive team on the surface may, at any time, call a diver back to the surface.
O.C. 425-2010, s. 3.