The letter says: "There's a secret tunnel inside my secret base. It looks like I'll have to stay in the tunnel and wait for backup. You'll have to find the Big Ancient Tree (140,190, 90) first. I left a note in a mound of dirt near the tree. It contains information on the sequence that opens the secret tunnel. Follow the sequence to break through the barriers and find me. Note 1: Don't get too close to the sealed tunnels. Note 2: Entering the wrong sequence will give you an electric shock. Note 3: Entering the wrong sequence will reset the barriers." Related Quest: "The Hiding Pirates"