Yup! 1 in competition and a few sambas when I was first starting to train. I don't recommend them haha! For me not unpleasant, but the shock/fear in those who witnessed the BO was regrettable.I have never experienced SWB. anybody here ever experienced one??
As trux said, relatively safe when you're surrounded by safety divers, and it's spearos that die, not freedive competitors.