NASA's Mars Global Surveyor shows evidence of a collapsed lava tube (or other form of subterranean channel) on the plains northwest of the Elysium volcanoes on Mars.

16 April 2004
This Mars Global Surveyor (MGS) Mars Orbiter Camera (MOC) image shows evidence of a collapsed lava tube (or other form of subterranean channel) on the plains northwest of the Elysium volcanoes. Lava or another fluid (e.g., water) was transported through a subsurface channel; later, the roof collapsed to form a series of pits and troughs, revealing the channel's location. This landform is located near 32.7°N, 219.5°W. The image covers an area about 3 km (1.9 mi) across. Sunlight illuminates the scene from the lower left.

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