It was a harsh struggle for a long while, with both sides on a stalemate, until one of the Astro machines, named the Crystal Reaper, accidentally stumbled across the cracks forming the surface of the Alien Hive on Olympus Mons.
Volcanoes have indeed been clearly observed on other bodies in the solar system – on some, such as Mars, in the shape of mountains that are unmistakably old volcanoes (most notably Olympus Mons), but on Io actual ongoing eruptions have been observed.
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