Isolation tanks definitely help with OBEs. Just to clarify, the tanks only completely eliminate the sense of sight, it's the darkest dark you would likely have ever seen. Smell remains intact, sound is limited to your own breathing and heartbeat, feeling is suppressed by the body temp water, and taste is irrelevant. Basically it puts you into a meditative state without the mental discipline it takes to reach the same state without the tank. You wouldn't remain in the tank for 10 hours either, typically an hour does the trick (and one hour time slots are what most float locations offer). Having so many senses suppressed automatically enhances the likelihood of an OBE because you are getting rid of most distractions. The first time isn't likely because you are too occupied with thinking about yourself in the tank, but the more you try it, the deeper you'll be able to go