From an orthodox Christian sect, the parents and two young kids fled Stalin's persecution in 1936 and went deep into the wilderness of Siberia. Two more children were born in the wilderness. They lived off the land with no contact with anyone until a team of Soviet geologists prospecting for iron ore saw their homestead from the air in 1978 and stopped by for a visit.
http://www.smithsonianmag.com/histo...ontact-Unaware-of-World-War-II-188843001.html
http://www.smithsonianmag.com/histo...ontact-Unaware-of-World-War-II-188843001.html