Sampling huts on Station No. 1 at Lake Baikal, Siberia.
Gas bubbles from submerged wood at the shore frozen into the ice at Lake Stechlin in Brandenburg, Germany, in 2011.
Odd ice formations
Ice at the southern shore within a reed stand, at Lake Stechlin in Brandenburg, Germany, in 2011.
Deep, dark samples
Researchers Mike Sturm and Lena Vologina extract sediment cores from frozen Lake Baikal in Siberia.