to come by the materials needed for such an operation. Did he simply limit himself to storing the air in high-pressure tanks and then dispense it according to his crew’s needs? Perhaps. Or, proceeding in a more convenient, more economical, and consequently more probable fashion, was he satisfied with merely returning to breathe at the surface of the water like a cetacean, renewing his oxygen supply every twenty-four hours? In any event,
to come by the materials needed for such an operation. Did he simply limit himself to storing the air in high-pressure tanks and then dispense it according to his crew’s needs? Perhaps. Or, proceeding in a more convenient, more economical, and consequently more probable fashion, was he satisfied with merely returning to breathe at the surface of the water like a cetacean, renewing his oxygen supply every twenty-four hours? In any event,
