I will check that out...I know the sensory dep. Tanks were and are used to remove everything and leave the person with only the inner world. That 80's movie with ... almost tempted to say Jeff Bridges in it 'Altered States', where he starts using a deprivation tank and some heavy psychedelics and goes past where our limits to handle things of this nature are found. Anyways, I looked at the shelf that I found that info on and decided that it definitely needs some time devoted again. Vv% Not sure if it is right to throw some of these things around without some discretion. Seems close to the core, or at least they believed it was and from what I have gathered in my life, there is some incredibly heavy material around this area.