312.91. Ice diving: The following safety standards must be complied with when ice diving:(1) the dive team must consist of at least 4 divers, including 1 diver, 1 standby diver and 2 diver’s tenders, 1 of whom is the diving supervisor;
(2) no diver may go under the ice more than 50 m from the point of entry into the water;
(3) the bearing capacity of the ice must be evaluated;
(4) the hole made in the ice must(a) be triangular;
(b) allow the passage of 2 divers; and
(c) have a perimeter visibly defined; and
(5) the piece of ice taken from the hole must be(a) removed from the water to avoid forming an obstacle or binding the lifeline; and
(b) put back into place after the dive.