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Answer:
Because if they don't that would be reckless and they could suffocate and die
Step-by-step explanation:
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Answe
They should pay attention because there is no free oxygen in the sea water since the little dissolved oxygen present in water can't be used for breathing by divers; It can only be used only by aquatic animals. So they need to check how much oxygen they have left so they can go back to the surface.