I learned how to swim not too long before my honeymoon to Hawaii, and I was worried because prior to this tour, I'd never swum in the ocean let alone at night. However, the crew was extremely helpful and attentive to those who weren't comfortable swimmers (like myself). I never felt unsafe in the hands of the crew.
The trip out to the site was magnificent, especially under the stars of the Big Island. In the water, we saw a number of manta rays who came so close to us in the water. They swam just under our bellies, and I'd never been so in awe of these majestic, gentle creatures. I gained a newfound respect of manta rays (and the ocean) after this tour, and I thank the Hang Loose crew for making this such a memorable experience!