To help deep-sea divers breathe, they carry cylinders of oxygen mixed

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To help deep-sea divers breathe, they carry cylinders of oxygen mixed with

chlorine
helium
nitrogen
ozone
This question was previously asked in
UPSC NDA-2 – 2022
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To help deep-sea divers breathe, they carry cylinders of oxygen mixed with helium.
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.
Other gas mixtures like Trimix (oxygen, helium, and nitrogen) are also used depending on the depth and duration of the dive. Chlorine and ozone are toxic gases and would not be used in breathing mixtures.

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