This scientist lived for two weeks under a lake in a steel capsule designed to keep him alive. It included a toilet, an algae garden for converting carbon dioxide to oxygen, a bed, an exercise bike which generated electricity, and a manhole so fresh water and food could be delivered by divers. It doesn't look like the capsule had windows, though, which would have sucked. He kept in touch with the outside world using a waterproof laptop and a wireless Internet connection.
I've always been in favor of living environments which would conceal the fact that humans are living there. My big wonder is why more dwellings are not placed underground or buried in a hillside. I would imagine that climate control would be a lot more energy efficient.
Via: Boing Boing