336(1)Where an atmospheric diving system is used, a diving supervisor shall locate the nearest back-up atmospheric diving system unit or other unit with sufficient depth capabilities to effect a rescue and shall arrange for its use in the event of an emergency.

336(2)A diving supervisor shall ensure that an atmospheric diving system is not used unless the on-board reserve life-support system will sustain life for the period of time that would enable the back-up unit required by subsection (1) to reach the site of the underwater diving operation and conduct rescue operations.

336(3)Where an atmospheric diving system is used, an employer and a diving supervisor shall each ensure that a contingency plan is prepared for dealing with