When the environmentalist and filmmaker Rob Steward died following a dive during the filming of scenes for Sharkwater Extinction, it came as a big shock, which reverberated across his huge diverse following and fanbase across the world, including the dive community.

How could a dive go so tragically wrong and who was to blame for his untimely demise?

Stewart is best known for his 2006 documentary Sharkwater in which he examined and exposed the shark-hunting industries of the world and the effect upon the ocean ecosystem.

Rob Stewart, 37, was diving with a small group on the wreck of the Queen of Nassau near Alligator Reef off Lower Matecumbe Key in about 225 feet of water, his sister Alexandra Stewart told Miami Herald on Wednesday morning. He was filming an installment of his Sharkwater documentary series, she said.