Undergroundy is an interactive Earth visualization that lets users explore the planet at different depths and switch between map overlays. Its interface includes a depth slider, along with controls to spin or reset the view, making it possible to adjust how the globe is displayed. Users can select geological layers and features such as ground cover, soil quality and depth, lithography, bathymetry, elevation, terrain, and geological periods spanning the Cenozoic, Mesozoic, Paleozoic, Neoproterozoic, and earlier eras.

The available overlays also cover tectonic plates, the asthenosphere, magma, and the Earth’s iron and nickel interior. For geographic context, Undergroundy includes countries, states and regions, localities, cities, buildings, roads, and railways, as well as rivers, oceans, mountains, volcanoes, boreholes, caves, and mines. Additional layers identify latitude and longitude, the poles, the axis of rotation, magnetic poles, and magnetic fields.

The site also lists real-time earthquakes, tsunamis, and volcanic activity, bringing physical geography and dynamic Earth processes together in one exploratory interface