The tour is a physically demanding tour in rough open ocean waters not a like a lake boat ride. (seelava.com)
When that edge moves off the continental shelf into deep open ocean waters, the productivity drops off and the marine organisms that feed larger wildlife are out of reach, scientists say. (scientificamerican.com)
For this reason, it is best that you are comfortable swimming in deep, open ocean water for this particular tour. (seaquesthawaii.com)