Question

Underwater, divers must breathe a combination of_______ and________.

Answer 1

Oxygen and helium

Step-by-step explanation:

Due to increased pressure of water in the deep water, inhsle of direct oxygen to the divers ios very harmful for them and can even lead to death. Hence, the oxygen cylinders, they use contains mixture of gas, not only oxygen.

Heliox is a mixture of oxygen and helium which is usually used for deep diving to reduce the narcotic effect of breathing gas when at depth.

Answer 2

The correct answer that would best complete the given statement above would be OXYGEN and HELIUM. Or in other terms, it is known as HELIOX. Heliox is the mixture of oxygen and helium and it has a lesser density than air. Using heliox for breathing decreases the resistance to flow within the airways and also decreases the work of breathing. Hope this answer helps.