Rob Stewart has died at age 37. And now fans are wondering what happened to the Sharkwater filmmaker.

Stewart disappeared on Tuesday while filming a sequel to his acclaimed documentary. He and diving instructor Peter Sotis were at the Queen of Nassau wreck near the Florida Keys to shoot some sawfish for the new film.

Reports say the two went deep diving three times near the wreck. But after emerging for the third time, Sotis began to lose consciousness. While the crew tended to him, Stewart disappeared into the water. His body was discovered Friday evening around 220 feet under the surface.

Rob Stewart Filming Rob Stewart was filming a sequel to 'Sharkwater' when he died.

"Rob has been found, peacefully in the ocean," read a statement on the Sharkwater website. "There are no words. We are so deeply grateful to everyone who helped search, and happy that Rob passed while doing what he loved. We are working on how best to honour his incredible work. The Stewart family kindly asks that they are given some private time to grieve."

Before his death, Rob Stewart was passionate about marine life from a young age. He enjoyed scuba diving and swimming as a child and even got certified by the Professional Association of Diving Instructors on his 13th birthday.

"It was such an overwhelming passion for him, and he was so good at it he made the beauty of diving accessible to us," Rob's sister Alexandra Stewart said after his death. "It was clear that [diving] was going to be a huge driver in his personal and professional life."

Watch Rob Stewart's film Sharkwater below.

Rob Stewart went on to study marine biology and zoology in college and became passionate about conservation. He went on to film the 2006 documentary Sharkwater, which exposed the practice of shark finning. The film won 31 awards and helped get shark finning banned around the world. Rob Stewart also directed and produced the 2012 documentary Revolution, which focused on other threats to the environment.

"This century we're facing some pretty catastrophic consequences of our actions," Rob Stewart said several years before his death. "We're facing a world by 2050 that has no fish, no reefs, no rainforest, and nine billion people on a planet that already can't sustain seven billion people. So it's going to be a really dramatic century unless we do something about it."

What are your favorite memories of Rob Stewart? Let us know your take in the comments section below.