Height 611 is the mountainside where locals watched a blazing red ball flying half-a-mile above ground suddenly plunge to Earth in the 1980s.
The strike - dubbed "Russia's Roswell Incident" after the famous 1947 New Mexico UFO - was set upon by Soviet scientists, who made some remarkable discoveries.
Locals descended on the crater near Dalnegorsk in Russia's far east, and harvested otherworldly metallic droplets with an unexplained chemical composition.
The only thing that could cut through the mystery material was a diamond saw blade.
Now, 39 years later, Brit investigator Philip Mantle has dubbed the incident "The Russian Roswell" - after the famous UFO crash in the New Mexico desert, USA, in 1947
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