An aluminum 80 bailout. Inverted bailouts weren’t the norm yet. We had a problem with our push-pull system (surface based closed circuit recirculating) the day before so we just went on open circuit air until we got the doors of the first class foyer burned off. The Port side was only about 160'. We were on HeO2 when we penetrated the hull and inside the habitat — we couldn’t afford a support ship and a surface based diving system.
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Thats a great picture.
Dont see single bailouts often with valves on top.
Hardly anyone does open circuit surface supply anymore with large He percentages due to the huge costs of the gas. Its all about He recovery now. when youve got 10 divers under, breathing 4/96 or 2/98 it starts getting expensive.