Jeff Rotman / Free diver swimming amongst Californian sealions (Zalophus californianus) Anacapa Island, California, Pacific Ocean Model released

Jeff Rotman / Free diver swimming in shallow water over coral reef, Sinai, Egypt, Red Sea Model released Model released.

Jeff Rotman / Free diver exploring blue water beside coral reef, Sinai, Egypt, Red Sea Model released Model released.

Jeff Rotman / Free diver coming up from dive to explore coral reef, Sinai, Egypt, Red Sea Model released Model released.

Alex Mustard / Diver catching a Lionfish (Pterois volitans) in collection tube. The Indo-Pacific lionfish are an invasive species on Caribbean reefs and free from natural predators thrive at much higher population d...

Alex Mustard / Diver catching a Lionfish (Pterois volitans) in collection tube. The Indo-Pacific lionfish are an invasive species on Caribbean reefs and free from natural predators thrive at much higher population...

Alex Mustard / Colourful sponges in the darkness of Thunderball Cave with a free diver in the background, Staniel Cay, Exuma Islands, The Bahamas. Tropical West Atlantic Ocean, Caribbean Sea.

Jeff Rotman / Boy (nine years) free diver holding green crabs, Plum Cove, Gloucester, Massachusetts, USA Model released Model released.

Jeff Rotman / Man filming his daughter free diving amongst Giant kelp forest, Anacapa Island, California, Pacific Ocean Model released Model released.

Jeff Rotman / Free diver swimming over coral reef, Sinai, Egypt, Red Sea Model released Model released.

Jeff Rotman / Free diver exploring a coral reef in shallow water, Sinai, Egypt, Red Sea Model released Model released.

Jeff Rotman / Free diver exploring a coral reef, Sinai, Egypt, Red Sea Model released Model released.