This photo is from Yakimenko's archive,
Группы Согрина; Потапова; Авенбурга. Формально руководит Чернышев.
Все фотографии из архива В.Г.Якименко (кроме 3S-48 - 3S-53 - из архива П.И.Бартоломея)
Taken from the air on the way to the pass. This clearing looks way too rectangular to be natural. Was there a runway there, long abandoned? It can't be recent because of the trees growing in the center.
I can only imagine the need for this clearing in case there was a military base of some sort there... Logging or mining operations would have road or rail links.