I was surprised that the pressure at 62 feet is still low enough that the internal air can be exposed directly to the water without a controlled pressure differ

I was surprised that the pressure at 62 feet is still low enough that the internal air can be exposed directly to the water without a controlled pressure differential. When I started reading I figured it was going to be something like a permanent submarine. I wonder if it's difficult to live under those conditions for weeks. Some video of the inside that also shows the water / air transition: https://www.youtube.com/watch?v=v3qqO8yQswg https://www.youtube.com/watch?v=v3qqO8yQswg