Io is one of the four Galilean moons. Io has several special properties that most other moons do not, such as volcanoes and a cave system. It also has the most gravity out of the Galilean Moons due to its density, making jumping less likely to result in falling into Jupiter. Being in close proximity of Europa and Ganymede as well, Io can be a decent gateway base between the two.
Appearance[]
Io is a visually distinct moon, with it being mostly yellow and brown, as well with the occasional volcano erupting across its surface. Its underground is covered in lava and rock.
Cave System[]
The cave system of Io can be found underneath the surface, either by exploding the terrain or finding a hole that goes through Io's surface.
The entire cave system is made out of molten rock. Within the cave system, there are lots of small holes that are barely enough for you to fit in. If you fall too deep, you may never be able to get back up again unless you use Explosive Charges or a Jetpack. It also has small ravines and other rocky features.
Colonization[]
Colonizing Io may be tricky to accomplish, as it has no water and no natural gas either. Despite this, Io has a good supply of metal, mostly medium and high metal, which can make it easier to set up a colony there before transporting water and/or natural gas to the base.
Colonizing Io's cave system can be annoying and you'll probably need Floodlights or Flashlights to see. If you do not have either of those, turn down your graphics to 5 or less.
It's also recommended to make a small ship for you to fit in a hole to get back up to surface, getting out with a Jetpack is another option.