In 1994, I was fortunate enough to get access to these prototype closed-circuit rebreathers. Alright, closed-circuit rebreather -- what is it about it that makes it different from scuba, and why is it better?
In 1994 had ik het geluk om dit prototype ‘rebreather’  Wat maakt zo'n rebreather met gesloten circuit beter om mee te duiken dan scuba?