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It was originally meant to have four air tanks, instead of two.

Using the remaining air tank to reach the surface was not a practical idea.

The air tanks strapped to his back were of an earlier model, but the color was the same.

It had an air tank fed by a small hand pump.

I should have seen to the air tanks and the expanding one before going below.

Take extra air tanks, water and whatever medical supplies you consider necessary.

"Best open up the suits to save the air tanks."

That would allow the system to work off the environment so they didn't have to wear air tanks.

The others, if able, would make for the air tanks.

It had been wearing an air tank, too, David noticed.