A night of silence descends on the race.

Participants face a 65-kilometer, autonomous section, with no communication, no settlements, and no possibility of outside assistance.

The route crosses three passes and three deep valleys, with an altitude gain of over 4,000 meters.

Fog complicates navigation, and GPS signal problems are a constant problem on this section.

We'll find out how many participants will make it to the Upper Balkaria Life Base by the checkpoint tomorrow morning.