That photo was selected from over 18,000 submissions and awarded the grand prize in the prestigious 2015 National Geographic Traveler photo contest. It also won 2nd place for Nature singles in the prestigious 2016 World Press Photo competition.
Here are a couple of other photos he has captured while diving with whales, dolphins, and other sea life:
Image credits: Video by Great Big Story. Photos by Anuar Patjane and used with permission