 When we're recording nuclear blasts from a long distance away, the signals are very small. That explosion will create waves that will travel out from that explosion. And as that wave travels past Tenant Creek, you will actually see the ground move up and down, or sideways. And that's what we're recording. Waramanga seismic station is located 50 kilometres south of Tenant Creek. We monitor any signs of nuclear activity across the globe and we report this data back to a UN body called CTBTO. This particular station is considered one of the best in the world because of its quiet site. Also because we are manning it 24-7, we have people that are living out there. It means that we can deal with problems immediately. This screen registers all the seismic events such as earthquakes and nuclear explosions. When you see a magnitude above 7, it's a really, really dangerous magnitude. The first thing I do is to pray God that it's not a big event and really hope that it's not happening in any of the populated places. Our station is part of a big community that is trying to monitor and make sure that we know what's going on around the world. You can't explode a large nuclear weapon in the world and not let someone know about it. We know where, we know when. We really know how big they're getting.