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My theory its the nitrogen thats not a useful for cancer .




Resistance to cancer

Naked mole rats appear to have a high resistance to cancer; cancer has never been observed in them. A potential mechanism that averts cancer is an "over-crowding" gene, p16, which prevents cell division once a group of cells reaches a certain size. Most mammals, including naked mole rats, have a gene called p27 which does a similar task, but prevents cellular reproduction at a much later point than p16 does. The combination of p16 and p27 in naked mole rats cells is a double barrier to cell proliferation.[17] Hypersensitivity to contact inhibition may be the reason for the cancer resistance of the naked mole rat.[18]]]



My theory is theres alot of carbon dixode exhales in a tunnel and not nitrogen gas,


To breathe underwater a diver must be supplied air at a pressure equal to that of the water surrounding the diver.

However there is an upper limit of oxygen pressure above which the oxygen becomes biochemically toxic.

Therefore, it is necessary to include something to dilute the oxygen in a diver's breathing gas. To satisfy normal breathing requirements at high pressures, it is necessary to supply between 0.2 and 1.5 atmospheres of oxygen with the rest of the balance made up by a non-toxic diluent (such as nitrogen).

There has to be another gas in that tank(s). It will be nitrogen and maybe even helium, depending on the dive.

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