Енисейский марафон

Friends and athletes Artem Vladimirov and Sergey Bastrykin went on an unprecedented expedition to the Krasnoyarsk Territory, Khakassia and Tuva. This segment of the route runs along the R-257 Yenisei highway, which is why friends called it the Yenisei Marathon. In a month, they traveled more than 1,100 kilometers, spent the night in tents and risked their lives more than once. Why and at what cost did they get this extraordinary journey?