Inside the Tower; Unmanned; Wonder of the World | 60 Minutes Full Episodes [40:27-41:03]

Well, we saved the best for last. We've made it all the way through nearly all the miles of the cave over three days and now we just have a little bit further to go. In fact, I can see the exit from here. We could see it that light up there, but we still had quite a climb to make. We learned by the end of our trek that Sondon may be even larger than we know. Hundreds of feet below that lake behind us, the water is draining somewhere. There could be more caverns beyond.