Harry : "Why would you be mad to try and rob Gringotts(Wizards' bank)?"
Hagrid : "Spells-enchantments," said Hagrid, unfolding his newspaper as he spoke. "They say there's dragons guardin' the high-security vaults. And then yeh gotta find yer way - Gringotts is hundreds of miles under London, see. Deep under the Underground. Yeh'd die of hunger tryin' ter get out, even if yeh did manage ter get yer hands on summat."
This is from Harry potter and I don't understand the meaning of that highlighted phrase. I mean, I do know the meaning of 'find someone's way' literally, but I don't know WHY is Hagrid saying that. Is it like "You'll be able to find out how you can get there, Harry."? ... It's like an irrelevant phrase in my opinion and It seems more natural without it..
I looked up the dictionary and found another meaning : come to a place or a situation by chance or without intending to, but I guess it's not appropriate here, neither..
Is this kind of confusion also because of my lack of english? or is it just my lack of understanding in reading?