Sacred site up to 17,000 years old - believed to be gateway to the underworld - under threat from modern spray paint artists.
Young women queue to be painted by 20 year old body artist Pavel Dorofeev aka Pasha Znag.
Culture on edge of Siberia was 'as advanced' as in Middle East, then considered to be the apex of development.
Investigation under way as mummified baby remains, bones and medical records found in disused facility.
Stunning statue with 'encrypted codes' is 11,000 years old, even more ancient than previously believed.
The animal got into a habit of visiting rubbish dumps on remote Novaya Zemlya, say researchers.