DON SHIRLEY SURVIVED that day, but he didn't walk away unscathed. He emerged from the recompression chamber at Bushman's, which was pressurized to a depth of 98 feet to shrink the helium bubble in his head, after seven hours, disoriented and barely able to stand. He was so weak that Herbst dragged a mattress over from the police camp so Shirley could sleep right there. Over the next two weeks, he endured ten more chamber sessions, for a total of 27 hours of treatment. It was more than a month before he could think clearly or walk down a crowded street without his perception and balance running haywire. "When I first saw him, I got a hell of a shock," Andre Shirley says. "He could not walk without support, and his thinking patterns had been affected. He would sound sane, but two minutes later he would forget what he'd said."
Shirley has improved with time, but the helium bend left him with permanent damage that has impaired his balance. In May he went diving again for the first time, with Peter Herbst hovering protectively alongside. He closed his eyes, turned somersaults, and with relief discovered that the Big Dive had not taken one of the things he loves most. "A cave is a place where I live," Shirley says.
A week after Shaw died, Gordon Hiles brought the video to a guest house in Pretoria, where Shirley was staying while undergoing recompression treatment at the Eugene Marais Hospital, and Shirley finally watched it. "It was difficult to see, but I really wanted to know firsthand what went on," he says. Later that day, Shirley took the video to the hospital, where he met with Herbst and Dr. Frans Cronje, medical director of Divers Alert Network Southern Africa, who was overseeing Shirley's treatment and assisting with the official accident investigation. They watched the video on a large screen and spent hours poring over every detail.
Shirley was so focused on what he was watching that he started mimicking Shaw's breathing. Then, determined to "see for myself what happened," Shirley volunteered for an unusual experiment. As Cronje carefully observed, Shirley sat with a CO2 monitor in his mouth and headphones on his ears, watching the video one more time. Every time Shaw breathed, Shirley breathed. Eventually Shirley was huffing through 36 shallow, extremely rapid breaths a minute.
"There was extreme hyperventilation," Cronje says. "On a rebreather at that depth, it would have been very ineffective." Shirley's breathing became so distorted that by the time Shaw faded to just six breaths per minute and then lost consciousness, Shirley was also on the verge of blacking out. His hands were weak and he could barely move. Cronje concluded that Shaw had passed out from carbon dioxide buildup and eventually drowned.
It took Shirley a full half-hour to bring his breathing back under control.