BioSub - A Self contained BiospheBeneath The Sea

My boss was just out at John Allen's (the guy who
financed biosphere II) place on Saturday, and
apparently they have been very quietly doing exactly
that. The new facility is windowless and
temperature-controlled, all lighting is electric and
carefully metered, and they are doing it on a much
smaller scale with the goal of figuring out the "not
dying" part rather than "let's cram in every ecosystem
we can think of".