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Anthony points out regarding the abyss:

>  (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.

I expect that when liquid breathing becomes a reality, the breathing system 
will provide positive pressure ventilation.  That is, it provides a small 
pressure differential across the lungs so that inspired fluid is forced into 
the lungs and expired fluid is drawn out, assisting the diver's own 
ventilatory muscles.

regards,

David Doolette
ddoolett@me*.ad*.ed*.au*

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