Yes, quite a few. Two of them were underwater, at the bottom of a Minnesotan lake. One was in a subterranean lava tube.

Tripping Underwater: My Adventures in “Psychoaquanautics”

Return to the Deep: Tripping Underwater, Part 2

Tripping Underground, or “Psychogeonautics”

There’s plenty more where this came from, but I’ve only just begun posting on this site. As I unload more of my trip reports here, should I make you aware of the notable ones?