Question

why do you think the scuba divers need air cylindres ​

Answer 1

Answer:

Sea divers carry oxygen gas cylinders along with them 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 be used only by aquatic animals

Answer 2

They don't take air with them according to the water pressure

Otherwise air will be passing through their skin and can lead to death

nitrogen and oxygen contains in the cylinders