S-2.1, r. 4 - Safety Code for the construction industry

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3.21.6. Emergency: Where the environment is unhealthy and the situation endangers the life or safety of a person, the employer:
(a)  must ensure that the emergency measures prescribed in section 3.21.1 are taken; and
(b)  may, despite section 3.21.2, allow a workman to enter the confined space if such workman has had special training for such circumstances and if he is informed of the hazards he will be exposed to.
O.C. 1959-86, s. 28.