The underwater cave

I was dreaming last night a very vivid dream. I only remember a snippet. The man was in the water with me explaining that because of the depth we were at the xenon was helping our bodies adjust to the external pressure. We were somehow deep under the sea but in a cave, there was a lot of external pressure on our bodies, but the cavity was completely populated with xenon gas. We were floating in the water about to descend again, but were taking a moment to fill our lungs with the xenon gas.

Is Xenon gas even breath-able? Gonna search it