ams511
Contributor
T In one episode, Mike was using a re-breather. And while the device looked quite different that they do today, since I don't dive re-breathers and therefore don't know their history, I guess I thought they were a more recent innovation.
Rebreathers actually predate open circuit scuba and were used by military divers. However, early rebreathers used 100% oxygen so were limited to only 20 feet or so because of oxygen toxicity.