Abby and I were permitted to spend over four hours in the Big Room,on our special preview tour. However, my ancient body was not happy in the 99 percent humidity so after two hours of concentrated photography we returned through the airlock to the Visitors' Center.
(The temperature and humidity are carefully monitored and controlled to preserve the fragile environment. The Big Roomwill be closed for tours from the middle of April through the middle of October because well over 1000 bats use the room for a maternity roost.)
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