"Yes. A scout party went back down to the same place the next year and set up a contraption like this one, except not as good, and used it to send signals out into the deep. Nothing. Years, then decades went by. All they had to go on was the one sighting. Some old Digger who had been on a lot of scouting parties came up with the idea of building a bigger and better noisemaker here—he reckoned that the shape of the crater would act as a horn, channeling the sound outwards. To make a long story short, it worked. Contact was made."