Roadtrip to Texas 2015 - dphannah
Underneath Biosphere II there was a system of tunnels, air coolers, and water pumps/filtration to keep the whole thing running. The most impressive was a pair of giant "lungs" - two domes that would expand or contract as necessary in order to maintain a constant air pressure in the facility.

Underneath Biosphere II there was a system of tunnels, air coolers, and water pumps/filtration to keep the whole thing running. The most impressive was a pair of giant "lungs" - two domes that would expand or contract as necessary in order to maintain a constant air pressure in the facility.