[In all honesty, the moment she heard about there being caverns under the cities...Ochako just assumed this would be harder than it seems. A compass wouldn't work underground if there was too high a concentration of magnetized rock, so charting a map, and scribbling a path on the walls would be their best chance of making it back out without too much trouble. Hopefully.]

Mm!! I thought the same thing when I heard there might be caves and stuff underground. [A-Again...] And that works perfect, thanks, Shoyo-san! Just be very careful and watch your step, ne? I can't imagine this place is going to be easy to get through.

[Traps, monsters, puzzles... Ochako's seen movies, read books, and played video games. This sort of shit is never just a leisurely stroll.]