1. The levels of qualification for a diver are: Class A, Class B and Class C. The holders of certificates corresponding to those levels may engage in recreational underwater diving using compressed breathing gas only on the following conditions:(1) Class A diver:(a) the dive must be made during daytime;
(b) the dive site must allow direct access to the surface;
(c) the dive site must allow the diver to orient himself or herself visually; and
(d) the dive must not exceed a depth of 18 m and comply with no-decompression limits;
(2) Class B diver:(a) the dive may be made at any time;
(b) the dive site must allow direct access to the surface; and
(c) the dive must not exceed a depth of 30 m and comply with no-decompression limits;
(3) Class C diver:(a) the dive may be made at any time;
(b) the dive site must allow direct access to the surface; and
(c) the dive must not exceed a depth of 40 m and comply with no-decompression limits.