(1) For the purposes of this Chapter, a person is diving if he or she—
(a) is in a chamber inside which the ambient pressure is equal to or higher than the hydrostatic pressure at a depth of 1 metre in seawater (whether or not the chamber is submerged in water or another liquid); or
(b) is submerged in water or another liquid and his or her lungs are subjected to a pressure greater than atmospheric pressure (whether or not he or she is wearing a wetsuit or other protective clothing); or
(c) is in a manned submersible craft that is submerged in water or another liquid.
(2) For the purposes of this Chapter, "diving" also includes diving using a snorkel and diving without the use of any breathing apparatus.
(3) For the purposes of this Chapter, diving does not include—
(a) diving using a snorkel; or
(b) diving without the use of any breathing apparatus—
for the purpose of conducting an environmental survey.