Yes! There are definite hints of human, unhuman and undead travellers in both the mines and the glaciers. There are also very faint signs of blood spillage, indicating there was bloodshed, but very limited.

He can also find signs of where the old passageways were — Deimar's people have now closed them off. There are clear signs of undead there, hinting they were discovered by the dead at some point.

And sure, feel free to assume his nose is guiding him through to find good corridors!