Chanced upon this article over the weekend while perusing the report of an unfortunate recreational diver who foolishly attempted a 100m dive at The Blue Hole on a single 11 liter / 83 cu. ft. tank of compressed air
DiverNet's article on The Blue Hole, DahabMap of the Arch at The Blue HoleAn instructor later recovered the tank and BCD at 168m but could not locate the body. (I wonder how much the deceased's next-of-kin paid the instructor to pull off such a profile).
Anyways, DiverNet's description of hanging there, weightless, insignificant, surrounded by the vast blue nothingness, made me homesick for deep diving...
The closest approximate I can come up with is this:
Imagine that you are listening to your favorite song in the darkness, alone. Imagine how the notes, the riffs, the melodies wrap themselves around you. Now try to imagine that the feeling of this "enwrapping" sensation is tactile, physical, tangible. That, is the feeling of floating, weightless, hundreds of feet down from the surface, suspended motionless over a seabed that is hundreds or thousands more feet below you, unseen, unseeable...

-Lost81