I was about 100 feet down, but couldn't tell the difference between there and on the surface.

Wow, I think the deepest I have been is 60 feet or so.

It amazed me just how "weightless" one feels at that depth. I think that it must be a little like that if one was in space.

Yes. This is the main reason I enjoy diving.

I also enjoy the throb of the tide;
either pushing you in or pulling you out as the wave motion rocks.