The deep-sea visions
One of the simplest ways to dive into the deep sea uses the spacesuit, what astronauts use outside their spacecraft. This kind of suit would stand the pressure of water, and the user of that thing doesn't need the decompression and the pressure in the suit can be the same with the atmosphere. Or in some other visions, the pressure in the suit will be rising, and when the diver would come up, the intelligent system would decrease the pressure.
If we are thinking about the real space suit, what stands the pressure the price of the system would be extremely high. But using space suits divers can operate in the deepest sea.
In this case, the diver would use the special gas mixture in the deep sea, and when that person rises, the computer changes the bottle, and the person starts breathing normal air. In this case, the spacesuit would have the system, which takes care of the decompressions and gas mixtures.
When we are thinking about futuristic scuba-diving there is the possibility to inject nanotechnical filters in the human body, which removes the carbon dioxide from the hemoglobin, by separating carbon from oxygen. But this kind of thing is the wild futuristic visions.
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The liquid breathing
The use of polyfluorene carbonate as the breath in deep-sea diving is a complicated thing. The thing is that when we are talking about principles that the lungs would fill by the liquid, we must remember one thing. PFC is acting like air. The carbon dioxide must remove from that liquid in the diving suit, and this is the thing that is the problem. If we just fill the suit with PFC, we would face the thing, that we must find the thing, that the real-life diving suit is something different from some tank in the laboratory.
If we would put the rat in PFC, the lifetime of it is approximately something about two hours, and filling the lungs by using PFC is not comfortable. In normal recycling scuba-diving systems the air goes through the carbon filter, which separates the oxygen from the carbon. This is the thing that cannot be used in the PFC-breath systems.
When we are thinking about the long-term scuba-diving in the extreme deep sea, we must remember that there are limits in that kind of thing. Liquid breathing is one of the most promising advantages in deep-sea scuba diving because the user doesn't need special preparation. And the thing is that the diver must follow instructions carefully. The thing is that the technology goes advancing all the time, and that means that by using nanotechnology is the possibility to make the layer, what acts like gills of the fish.
By using artificial gills, the diver can, in theory, dive extremely long time. There is a possibility to install the tube in the blood veins of the diver. And then recycle the blood through the oxygenizer. The system is the portable heart-lung machine, but if this kind of system is used, that thing needs the surgical operation, which makes it difficult to use.
When we are thinking about the liquid breathe the reason, why engineers and researchers are working with this kind of system is that they are safer than some methods, where the tubes would put surgically in the veins. If the tube is removing, the leak of blood would cause death. There is also infection danger in that kind of system, and that means that the operator needs special prepared medical staff for supporting themselves.
Liquid breathing: https://en.wikipedia.org/wiki/Liquid_breathing
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