For someone late to the game can someone give a brief factual description of what happened. All Google showed was that he drowned after surfacing.
What happened is, of course, the million dollar question. Without bogging down on the hundreds of details, Stewart went on a final dive of the day to 200 feet to retrieve an anchor that attached the dive boat to the wreck where he was filming. He and his buddy, Peter Sotis, surfaced from that dive, gave an okay sign and after that there are as many versions of what happened as there are people who were on the boat. What we can say as fact is that Stewart disappeared and was found three days later on the bottom. I've attached a link to my documentary and it gives you more details. My upcoming book will give even more.