“Every single station picked it up. It’s the biggest thing that we’ve ever seen.” That’s Ronan Le Bras’ description of the size of Tonga’s volcanic eruption. And that’s saying something because Le Bras is “a geophysicist with the Comprehensive Nuclear-Test-Ban Treaty Organization in Vienna, Austria, which oversees an international network of remote monitoring stations.” A nuclear-test monitor calls Tonga volcano blast ‘biggest thing that we’ve ever seen.’