Freediving at the SETT
As some of you already know, I'm a qualified PADI dive instructor, and spent a good part of my twenties travelling around Asia, teaching people to dive. During the surface intervals, me and some of my colleague would jump off the side of the boat to practice our breath hold diving. We started just by finning down, but quick progressed to variable weight diving where we'd grab hold of a weight belt to pull us down, and then haul it up afterwards. We weren't very good, and I've later found that this practice was also quite dangerous, but it was fun and killed some time.