their natural habitat is something that most people only could dream of. >> the reef is teeming with life. fish of all shapes and sizes, beautiful coral, a rare chance to interact with some of the planet's most interesting characters. >> we had numerous animals. we had nurse sharks, barracudas and goliath groupers and green moray eels. these are my pets. most people have cats and dogs. i have animals under water. >> the sea pro gives his clients a little something extra, physical encounters with sea creatures that strike fear into the saltiest seafarer, like the 300-pound nurse shark. dave feels the key to the carnivores' trust is physical affection. >> whenever you hold a nurse shark, they typically just go to sleep. they're one of the most docile animals that you will find in the wild. they want to be hugged. they want to be scratched. they want you to pet them.