You hear - and feel - a booming resonance. You’re sensing the signature low frequency bellowing of Goliath groupers. Then you are in the midst of underwater titans up to eight feet long and weighing more than 500 pounds. It’s an unforgettable big-animal dive experience. The offshore reefs of Jupiter, Florida, host a year-round population of these gentle giants. In late summer, several intentionally sunk ships host spawning aggregations of the largest grouper in the Atlantic. You’ll be diving the only known spawning site for this protected species on the U.S. Atlantic coast.