Speaking of sinkholes, have you seen this video of world champion freediver Guillaume Nery base jumping underwater into Dean's Blue Hole? Way back in the early 1980s I was working at Outside magazine when the base jumping sort of got started, and I met some of the early pioneers of the sport, one of whom died shortly after I interviewed him. (That's the problem with writing about base jumpers.) Dean's Blue Hole is a 663-foot pit in the ocean floor in the Bahamas. Nery was accompanied on his dive by cameraman Julie Gaultier, who says "our goal was to emphasize esthetic images and innovative camera moves." They certainly did that. Also, the entire video was shot on one breath of air.