Dr. Wafel Zinraal's Diary, April 22

The old priest Montoya led us down into the mission's catacombs last night. We've made some progress in using the sonar mapper, but so far there isn't any sign of the Iron Cavern of Castilla or the spiral tunnels that supposedly lead into it. We have to find that cavern as soon as possible. Without Ramon Velasco's War Chalice, we would stand little chance at the front...