Where almost indefinitely is defined as 12 days for now. It seems that he could have lived there 'forever' with just some electricity supplied from the outside, and food from containers. http://blog.wired.com/gadgets/2007/06/the-biosub-a-fo.html I am intrigued by the algae scrubber. What powers them ? Light ? Peter P. -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist