The limpet cities clung to the slowly-shifting ice, their floodlights the only illumination this world had ever known. A hundred kilometers down, mining outposts and automated foundries huddled around smoking vents like the tubeworms of silent Earth. In the bowels of Novivostok, a computer decided the current period of artificial light now signified morning rather than midnight, and a new day began for the last holdout of humanity.
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The first visitors to Europa (excluding any chance panspermia events in the distant past) came in 2075, as the crew of the Vitus Bering, a joint Russo-American scientific expedition sent to survey the system and scout locations for a future permanent outpost. While the surface was bathed in radiation from the van Allen Belts of Jupiter, the icy crust could provide excellent shielding, and ‘lakes’ of liquid water and deposits of usable minerals were scattered through the ductile lower layers. This was to say nothing of the vast, lightless sea under the ice, and whatever strange organisms might be lurking there. Previous unmanned expeditions had managed to penetrate into the crust and find evidence of biological activity, but none had yet reached the seafloor or found anything larger or more complex than a lamprey.
Orbital mechanics and Earthly concerns prevented any human return until 2099, when the first mid-crust habitat was settled, having been prepared by robotic pathfinders dropped through the 2080s. Mars had a growing colonial presence, and the resources of the Asteroid Belt were beginning to be exploited. Europa, it was hoped, would be the gate to the middle Solar System, opening up the Jovian and Saturnian systems for intensive research and economic development, and a stepping-stone to exploration of the Solar System’s outer reaches. The first settlement, simply dubbed ‘Basecamp’, crept deeper and deeper through the crust over the years, expanding into new galleries and hollows in the ice, and encountering pocket ecosystems of isolated organisms as it went. Each of these had been cut off by icequake or rift at some point, and had evolved in divergent directions, to the fascination of resident scientists.
Expansion and colonization continued apace through the 2100s, and in 2112, Basecamp reached the sea, and began to grow out along the bottom of the icecap, and down into the gloom. Fueled by Earthly capital, Martian industry, and Belt resources, the 2110s through the 2130s were a golden age for Europa, and in 2124 humble Basecamp was formally rechristened Novyy Vostok, after the Antarctic research station that had been the model for so much of early space exploration. It was soon joined by other stations that had made it through the ice, and by 2130 100,000 people called Europa home. New advances in material engineering had allowed probes to survive the immense pressure to reach the seafloor and discover hydrothermal vent communities as rich as those on Earth, and deposits of valuable metals and minerals around them. Soon these deposits could be harvested, and the burgeoning cities could rely less on imports to sustain themselves. Already native industry could supply some building materials and simple consumer goods, and homegrown food fulfilled 30% of the moon’s needs, and these numbers were only expected to grow.
By 2141, however, the shine had begun to fade. The Jovian system was no longer the frontier it had once been, and Europa was increasingly relegated to a scientific curiosity and a stopover point on the way to Titan, Enceladus, and the wild space of the Kuiper Belt. The corporate colonies on Ganymede could afford to poach the best scientific and engineering talent in the Jovian system, and the boomtowns of the helium-3 industry around Saturn drew fortune-seekers and ambitious young people. Europa’s population grew slowly through the rest of the 22nd century, while expansion of infrastructure on the seafloor continued. Occasional flurries of colonists would arrive following some new discovery, but the routine of Europan life slowly settled into mundane normalcy. The eleven city-states of Europa had carved out a niche, and found themselves comfortable in it.
On June 9th, 2240, contact with Earth abruptly ceased. No declarations of war were broadcast, no cries for help sent out, no explanations for the sudden lack of communication were given. Mars deployed an emergency expedition to Earth to assess the growing crisis, and on July 11th, Mars too went quiet. The middle and outer Solar System erupted into panic. 99% of humanity was suddenly unaccounted-for, and the survivors were cut off and on their own. The many small settlements in the Belt and outer planets had always had far more people than their station gardens could completely feed (as their economies were largely based on export of raw materials), and their panicked residents fled for the perceived safety of the more established societies when cut off from Earth and Martian shipments. Ceres, largest and wealthiest of the Belt communities, imposed martial law to support a harsh lockdown following the initial surge of refugees, until overcrowding and excessive burdens on its sanitation systems led to outbreaks of cholera and tuberculosis, devastating its population. The survivors slowly dwindled as their station’s machinery broke down beyond their ability to repair, until the last transmission came in 2262. Heavily dependent on Mars and Ceres pre-catastrophe, the remaining Belt stations winked out one by one over the years, as their systems failed and their denizens died or fled.
It was hoped that Ganymede, second-largest (after Europa) of the human settlements in the Jovian system, could be an island of stability and share the burden with its neighbors through the crisis, but it too did not survive. Its population, long chafing under increasingly authoritarian corporate rule and now swelled by refugees from in-system, erupted into riots and later running battles in its cramped streets following the imposition of unequal rationing and rumors of hoarding by elites. Access to oxygen and drinkable water became the primary weapons in the expanding Ganymedian civil war, and large sections of its cities were rendered uninhabitable. The civil war reached its peak in 2243 with the dropping of an 11km Trojan on the surface, directly above the administrative center of the largest city. While the hated General Operations Board was obliterated (along with 250,000 other people), the resulting moonquakes reverberated through the icy crust, destroying most of the settlements and cities embedded within it. The few survivors of Ganymede’s civil war found themselves buried alive and unable to communicate with the rest of the Solar System, and Europa could spare no resources to help them. One by one their limited oxygen and food stores ran out, and the isolated holdouts perished in their caves of ice.
On the day the Earth was lost, Europa was home to 2.8 million souls. When the Martian expedition failed and the Belt societies began to crumble, refugees flooded in. Within a year, the population had boomed to almost 5 million, and the moon’s infrastructure, already near its limit pre-catastrophe, could not handle the influx. When combined with the sudden lack of imports from further in-system, a humanitarian disaster unfolded. Diminishing food stocks were brutally rationed, and refugees from the Belt and even some of the outer Jovian satellites began to be turned away. Existing air scrubbers and oxygenation stacks were utterly inadequate, and fuel refineries had to be jury-rigged to produce breathable oxygen from local water instead of LOx propellant. Worse still, Europa had never entirely become industrially self-sufficient, and much of its advanced mining, metallurgical, and life-support systems were reliant on sophisticated components imported from in-system. Authorities scrambled to bootstrap native industries to pick up the slack, but the sudden strain threatened to overwhelm even the combined efforts of the limpet cities, and many faced collapse. On the radiation-bathed surface of the icecap, some squatter communities attempted to scrape out a livable existence, but quickly succumbed.
Europan authorities had maintained contact with their counterparts on Titan and Enceladus, and these two societies were under even greater strain. Never even close to self-sufficient, having been largely a resource colony and hub for helium-3 mining on Saturn, Titan’s infrastructure quickly collapsed without outside trade, and its starving population fled for its icy neighbor. Enceladus hosted three small limpet cities like those on Europa, and had been quickly expanding in the pre-crisis boom years. Its ocean was much richer in complex life, and several species even showed some rudimentary intelligence, not unlike the cephalopods of Earth. Three million desperate Titanians swamped its life-support systems and contaminated its sea beyond recovery. Two years after the inner-system catastrophe, Enceladus too went dark.
It is unknown whatever became of the researchers and wildcat settlers in the outer Solar System, but save for a few haggard survivors burning hard in-system and a number of automated distress beacons, no signs of life were detected beyond Saturn. Europa was alone.
By 2245, the torrent of refugees had slowed to a trickle, but their numbers buckled the existing infrastructure. Resentment between native Europans and their fellow humans boiled over into riots and pogroms on numerous occasions, and outbreaks of disease in the crowded conditions were common. Equipment failures from overuse and rushed maintenance were happening with distressing frequency. The city-state of Thera was flooded in its bottom third after its lower docks were breached, killing 20,000 people and displacing half a million more. Suicide rates spiked in the immediate post-catastrophe years, especially after the fall of Enceladus seemed to portend a similar fate for Europa.
Through it all, however, humanity endured. Many of the refugees from Ganymede and the outer system were talented scientists and engineers, and the Europan collective Emergency Government was unafraid to conscript them and any other experts it deemed necessary into a number of crash projects to jump-start the moon’s industries and achieve true self-sufficiency before existing resources ran out. Seafloor mining operations were widely expanded and geothermal wells sunk to provide power for automated foundries and factories, themselves hastily constructed to make up for formerly imported goods. While rationing never ended, new varieties of crops were developed to increase yields in the cramped station gardens, and the decision was made to engineer edible fauna from Earth genetic samples for aquaculture. While the risk of disrupting the Europan ecosystem was great, native fauna were inedibly alien, and the danger of starvation and malnutrition now was deemed greater than excessive contamination a century from now. Though these measures were undertaken with heroic effort, they were not enough to save everyone, and by 2260 the moon’s population had dropped to 3.1 million from starvation, disease, and societal breakdown. Ruined Thera was finally abandoned, and the Emergency Government adopted measures to maintain order that would have been considered cause for revolution pre-catastrophe, but with the clear danger of total societal collapse, and the likely extinction of humanity that would have ensued, few found the will to protest.
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Two hundred years later, Europa still stands on a knife edge. Its 3.8 million inhabitants are carefully shepherded by the now-established pan-Europan state, and every resource must still be stringently rationed to ensure enough for all, in the unending struggle for simple day-to-day survival. Everything that can be recycled is recycled, every machine is repaired and maintained long past its expected replacement, every birth must be approved, and every death is merely an adjustment to that cycle’s ration. Humanity has been cast once more into an inhuman abyss, and if it must abandon a bit of itself to survive, then that is a bargain it will make without hesitation.
Yet, bit by bit Europa is beginning to open up again. Birth quotas have been slowly increasing over the last few years, assembly restrictions are being relaxed, and the first expeditions back to the other Jovian satellites are planned. Io’s automated mines are considered a top priority for salvage, while the ruins of Ganymede may one day be rebuilt and reopened for settlement (rumors of blind cannibals haunting the ice grottoes notwithstanding). While no signals have been returned from the Belt since Ceres went quiet, some on Europa hold out hope for another survivor community in one of the millions of small bodies not accounted for in the chaotic early years of the post-catastrophe world. There is hope also for the Saturnian system, that some of the infrastructure there may be salvageable, and that new colonies may one day be established to relieve the pressure on the home satellite.
Earth and Mars however, remain quiet and crypt-dark. Each is still there, a point of light in the black Europan sky, but no signals are ever detected, and even simple spectrograph readings give bizarre and inconsistent results. Not even visual-band telescopes can properly resolve the homeworlds through electronic circuits, and unmanned probes can pass no further sunward than Eros before their sensors are overloaded with strange and nightmarish readings and contact ceases. Not even the most radical members of the colonization factions would advocate venturing with human-piloted craft into the inner Solar System past the Belt, and risk snuffing out humanity just as it is beginning to recover. If that means that no human will walk under an open sky again, then so be it. The survivors of Europa will make their own skies of ice and steel as lovely as lost, silent Earth’s, and the baleful red eye of Jupiter will watch over them if the distant Sun will not.