Europa, Jupiter's moon. Deep beneath the crust, the oceans are teeming with alien sea life. Shellfish, plants, corals, arthropods, even strange fish and larger sea creatures populate a wide-ranging interconnected web of hidden seas. Volcanism is rampant, warming the mineral-rich waters and creating excellent conditions for energy-harvesting.
The largest cavern close to the surface is known as The Pocket. This is where the initial teams of Stabilizers built their first outposts, with the intent to establish long-term communities capable of surviving indefinitely. Aqua-farming is well established; food and other sundries are efficiently gathered. The Pocket has many deposits of minerals and crystals that can be mined and processed to create strong and versatile construction materials locally.
