Rising out of the depths, a shape emerges from the shadows, methodically swimming in a wide arc. The outline is unmistakable, as it continues to climb and inch closer at every turn. With one last pass, seemingly in slow motion, I am struck by the sheer enormity of the creature in front of me. Visions of Martin Brody voicing his famous line, “You’re gonna need a bigger boat,” play through my head.

Bill “Hogarth” Main is the co-founder of the Woodville Karst Plain Project (WKPP) deep cave diving team, a world record breaking cave explorer, and godfather of tech and cave diving minimalism. With an energy that belies his 64 years, Bill Main climbed out of his car to greet me, looking every inch a child of the ‘60s in a Beanie hat, with wild wraparound sunglasses.

Last summer, my path led me for the first time to Newfoundland, Canada, more precisely to the town of Conception Bay South. Cave explorer Jill Heinerth invited me along with Rick Stanley, the owner of Ocean Quest Adventure Resort, to dive some wrecks in the bay. On this occasion, Stanley told us about a project whose realization he has been working toward for several years.

While studying reef sharks in Tahiti, I became fascinated by the behavior of the remoras accompanying them. They were fish of the Echeneidae family, and ranged in size from a few centimeters to about 50cm long. They were pretty silver fish with widened heads, and often a black racing stripe.

A volcano larger than Delaware and Rhode Island combined, Yellowstone National Park is a geothermal hot spot that attracts more than four million visitors a year. Wildlife roam the landscape freely in this caldera defined by ongoing thermal activity. In this unique landscape, opportunities for exploration above and below the water line abound.