Taking several branches and the floor of the wagon, you manage to rig up a crude cover for the bridge. At the same time, you reinforce the sides of the bridge, making it more stable.
You start to dig into the side of the ravine and break through into a 7 foot tall, rough cave. It is around 15 feet wide and a similar length. You can see several 5 foot tall tunnels leading into the darkness.
There is a massive pile of wood in this room, you recognize parts of the wagon.