Well, it it really deep. Not many lakes in Russia can compete with it. Most lakes in East-European lane are of glacial origin and are rather shallow
What an exciting legend! And thank you so much for this information. I've tried to search Wikipedia about this monastery, but there is absolutely nothing about it (on English).
Wow! Roman fortress is so tough that can stand a couple of thousands years even in snow!
What a nice picture! I've been here once, but it was rainy October.