A caver in an underground lake (IMAGE)
Caption
National Geographic photographer Carsten Peter (far right) takes a photograph as diver and National Geographic explorer Kenny Broad descends to the biofilms in Lago Verde. Penn State Professor Jennifer & Macalady (left) and expedition caver Martina Gianfelice (center) wait on the steep lake shore. Macalady's research takes her to some of the most hostile places for life on Earth, in search of the microbial biofilms that can survive there.
Credit
Dani Buchheister / Penn State
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License
CC BY-NC-ND