Discover the tunnel

One day, as you are exploring, you come across a cave in the mountain you have never seen before.
You go in the cave and discover that it is actually an old tunnel, long forgotten by the Elvish people.
You decide to go back to your home and gather supplies.
You get food, water, a lantern, and other necessities for a long journey in the dark.
You also bring with you your bow and arrow.
You return to the tunnel and go In.