The Caves is a map that has a backwards storyline.
View the Storyline
You wake in a room. You see a lone torch lighting the area. The exit is sealed in Obsidian, there is no escape.
You spot a chest. You open it. Inside there is chain armour and a diary. The diary reads: "Dear traveller. If you are reading this, I am already dead. I have left some fresh armour for you in this chest. Be careful. Monsters are everywhere... Along the tunnels I dug, there is treasure for you, considering that the zombies havent gotten to it.
Good luck,
Athem