A significant problem, however, arises from the high
viscosity of the liquid and the corresponding reduction
in its ability to remove CO2. All uses of liquid
breathing for diving must involve total liquid
ventilation (see above). Total liquid ventilation,
however, has difficulty moving enough liquid to carry
away CO2, because no matter how great the total pressure
is, the amount of partial CO2 gas pressure available to
dissolve CO2 into the breathing liquid can never be much
more than the pressure at which CO2 exists in the blood
(about 40 mm of mercury (Torr)).
The overlap between close-to-current sci-fi and real life in my brain is occasionally saddening/shameful.
Not sure using it for diving or space travel is a great plan if that's the case. Sure you could have a text or flashing lights method of talking but there's no communication method faster than yelling "HELP!" into your radio that I can think of
See, there is an air intake in your mouth - and trying to talk under water does not exactly result in the noises you expect when you're talking into air.
The sign used by divers to alert others is banging your knife against the air tank. There are actual hand signs for 'I'm in trouble' or 'I'm out of air'.
Thanks for that information :)
That said, I would love it if the OP game some additional context on why they submitted it - is this a response to something? Was there a new advance here? Just something cool they saw?