bringing a weapon like a knife will get your into trouble if police conducts check.
Who to know if you are going to rob someone in such a dark place?
Anyway prevention is always better, avoiding route you are unsure of.
What is few minutes wasted if you get back safely, compare to never getting there.
Make a big detour if one is unsure.
Also I never try stunts that endanger myself, for instance a particular shot that I thinks give me a better composition endanger myself or my equipment. I am just a hobby photographer, and not paid.