Peering through the windswept snow on a dark February day, the rescue party finally came on the first sign of life — the flapping remains of a tent pitched on ski poles on an uppermost slope of Kholat Syakhl, ‘Mountain of the Dead’ in the native language of northern Siberia.

But where were the nine young Russian students who should have been sheltering beneath the canvas?

Curiosity turned to mystery as human tracks were seen in the snow heading downhill away from the tent in single file for a third of a mile... barefoot human tracks.

In temperatures of minus 24! And mystery became horror when an inspection of the tent showed its front flaps still buttoned tightly together but huge knife slashes down the sides — through which the occupants apparently fled.

Inside was like the Mary Celeste, with everything intact — warm clothes, waterproof jackets, blankets and sweaters that would have been essential to survive in the Siberian weather; plus cameras, diaries and cooking utensils, all apparently abandoned in a moment of madness.

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