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Underground river in Novosibirsk (18 photos)
Sewerage seems
Hot underground river in Kiev.
What flows in underground rivers 4
What flows in underground rivers?
SAC-Aktun which is the longest underground river
Underwater river
National Geographic
Best photos for November 2012
Best Photos
Underground Lviv, the secrets of the past
A selection of photos of August from National Geographic
Hot underground river in Kiev.
What flows in underground rivers 4
What flows in underground rivers?
SAC-Aktun which is the longest underground river
Underwater river
National Geographic
Best photos for November 2012
Best Photos
Underground Lviv, the secrets of the past
A selection of photos of August from National Geographic
That's pool
Dog Bandit