It was not possible for him to have gone outside the air bubble.

Move it about until all the air bubbles come out.

That is what you see as white - air bubbles.

No air bubbles need to go back in through the hole.

Think of yourself as an air bubble that moves where you will.

The air bubble sat in the middle of the transit level.

Look for air bubbles in the water when you pump.

The air bubble in which he stood was being pushed out of shape by the water.

An air bubble with a soap skin may last several minutes.

As it gets hot, thousands if not millions of air bubbles form.