Volcanoes come with their own underground plumbing systems that move molten rock around and feed eruptions onto the surface. Sometimes these plumbing systems can drain causing collapses of the ground above them.

This image of Hephaestus Fossae shows a volcanic area where collapses like this happen. Chains of large elliptical pits mark the path that underground molten rock took. A much smaller isolated pit near the center of the image is probably a more recent collapse. This smaller pit is steep enough that the floor is shadowed, but with the right image processing we can still see the interior.

ID: ESP_080227_2015
date: 7 September 2023
altitude: 285 km

https://uahirise.org/hipod/ESP_080227_2015
NASA/JPL-Caltech/University of Arizona
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