How can we predict volcanic eruptions? How can we know about them before they happen? A nation full of volcanoes, Japan has been at the forefront of research seeking to answer these questions. On this program, we learn about instruments that have been placed inside volcanoes to measure their expansion, how magma movements are being measured by minute changes in gravitational pull, and how one cutting-edge experiment is using cosmic particles to peer inside volcanoes. Every improvement in volcano prediction has the potential to save lives. Meet the dedicated researchers who are blazing new trails in this field!