The following paragraph by ScubaLawyer came from a different thread, but I am re-posting it here since it is relevant to DIY diving equipment and the adventurous early Scuba divers that would go to great lengths and dangers to get underwater. This is Mark's response to my request to hear more about his Father's diving during WWII. Thank You for the story and great photo Mark!
ScubaLawyer wrote: ↑Mon Dec 10, 2018 9:56 pm
Dad always talked about snaking the emergency O2 tanks from the cockpit of his B-24 (not the huge O2 tanks that lined the walls aft of the cockpit and forward of the bombay doors/Norden Bombsight). He talked endlessly about spearfishing the shallow reefs of Waikiki, the walls off Kahuku, and the reefs off Barking Sand Kauai when he was stationed there during WWII. I never thought to ask him what he used for a regulator, if anything. I have a faint recollection of him saying something about using his oxygen mask from the plane and breathing O2 that way. I can only assume he would open the valve, take a hit, and close the valve again - letting exhaust escape around the face seal. That is only my wild speculative guess as I really have no clue. He passed in 2012 at age 90 and all of his Army Air Corps crew are dead as well. Shoulda, woulda, coulda, but didn't.
1944 Muroc Air Field - Dad kneeling 2nd from left.jpg