(7) In the film he communicated with base by typing on an alphanumeric keyboard strapped to a forearm. I did not see it close up, but likely it would be qwerty; the point is significant, because once in a factory I saw a machine tool and on its control panel was an alphanumeric pad which was arranged not qwerty but in alphabetical order, very confusing to type on. (8) As the liquid is far denser than air, likely you could tell a habitual liquid breathing diver by work hypertrophy of his respiratory muscles (intercostals etc), and his skeleton by thickened ribs with enlarged intercostal muscle attachment lines.
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