To help deep-sea divers breathe, they carry cylinders of oxygen mixed with
chlorine
helium
nitrogen
ozone
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Answer is Wrong!
This question was previously asked in
UPSC NDA-2 – 2022
At high pressures experienced during deep-sea dives, the nitrogen in air can cause nitrogen narcosis, which impairs judgment and coordination. Oxygen at high partial pressures can also become toxic. To avoid these issues, the breathing gas mixture often replaces nitrogen with helium, which is less narcotic and also less dense than nitrogen, making breathing easier at depth. This mixture of oxygen and helium is called Heliox.