Woman on an island, day 24

I grab my bag and I make a torch with a stick, some leftover material and lighter fluid. I head to the gaping hole, hesitate for a second and then I start climbing the ladder down. I have a bad feeling about this. The darkness swallows me as I leave the sunlight behind. The ladder extends much further than I expect and after 10 minutes my feet finally hit the ground. I look around, the flame dancing against earth walls. This looks like a...tunnel of sorts. Without hesitation I head down the tunnel, it takes a winding a route deeper into the earth. I reach a dead end. I hold the torch up to see better...it's a huge metal door! How am going to get past this? I push hard against the door and it swings open! Then I see what kept it open... A bone! A human leg!