And in fact ...
... they might be making an understatement.
That nightmare is in the Yakutia region of Russia and was built in the '50s when it became essential to connect the capital of the region, Yakutsk, to the Trans-Siberian Railway. This posed some difficulty, as the nearest train station was almost 800 miles away. Normally this would have been solved with a brand new highway, but as the Yakutia region is the absolute backwater of Siberia, it was not too high on the Soviet government's give-a-damn list. So they just mowed a half-assed dirt road next to a local river, named it the M56 Lena Highway, placed it on the list of actual federal highways and had the rest of the day off.
The thing about all the mud is -- wait, is that guy wearing pants?