The Wendelstein 7-X, an experimental nuclear fusion reactor in Germany, has broken the world record for fusion performance in a stellarator. In 2015, Science took a look at how it came together: https://scim.ag/2me54lZ | Science

Under normal conditions, the Wendelstein 7-X, an experimental fusion reactor in Germany, is off-limits—but during a scheduled maintenance window, National Geographic's Paolo Verzone and Massimo Nicolaci gained exclusive access. The twisting interior of this stellarator is designed to generate clean energy by fusing atoms together, like the nuclear fusion that occurs inside a star. Discover more about the Wendelstein 7-X: https://on.natgeo.com/3NmU0D3 | National Geographic Science