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In the summer of 1978 in the heart of Siberia,

a team of four young Soviet geologists made an astonishing discovery.

Flying in a helicopter over a remote stretch of forest, more than

150 miles from the nearest human settlement, they spotted what looked like a clearing below.

Inside that clearing was a large garden plot with rows of potatoes.

Next to it was what looked like a shelter.

Yeah, it must have been very much a surprise for these geologists

when they crossed the tiger in a helicopter in the 1970s

and suddenly saw the vegetable plot in the middle of the tiger

in a place where this was basically unthinkable. We're pregnant. and suddenly saw a vegetable plot in the middle of the tiger,

in a place where this was basically unthinkable.

Were people actually living out there, deep in the Siberian woods,

one of the most unforgiving landscapes on Earth?

The geologists didn't see anyone,

but they marked the mysterious location on their map and promised to return.

A few weeks after making camp at a nearby river, the geologists decided to investigate.

It was a 10-mile hike through thick strands of birch and Siberian pine.

Absolutely pristine, undisturbed wilderness.

It's very slow walking because the forest floor is not very solid.

It's covered with layers and layers of fallen trees

...