Richard Feynman describes his own experience of sensory deprivation tank in "Altered States" chapter of his "Surely you're joking, Mr. Feynman!" memoir.
That's really interesting. I didn't read that book. Did Feynman described an OBE he had? or some other altered state?
i recall... he described an OBE in detail, though i believe it described the actual visual effect as minor, he says he could change his perspective to be off to his left side or above himself, i dont think he says he flies off to some other world. The experience was enjoyable to him though, as he sought out the iso tank more often afterwards.
edit: he also did a small dose of ketamine one time he tried it and said it enhanced the effects