Venus may conceal a giant underground lava tube

Analysis of NASA's Magellan radar data suggests Venus may host a large underground lava tube on Nyx Mons, potentially stretching tens of kilometers. If confirmed, it would be only the second lava tube found on Venus and would support the view that the planet is geologically active; confirming its full size will require higher-resolution radar from future missions like ESA's EnVision with the Subsurface Radar Sounder.