After melting its way through over 10 kilometers of ice and descending down 60 kilometers of dark and freezing water, the ROV finally reached the rocky floor of Europa's ocean. As its brilliant floodlights illuminated the barren plains beneath it, it came upon a feature common on the abyssal plains of Earth; a hydrothermal vent. The probe was moments away from making the biggest and most astonishing scientific discovery in human history; for around the vents were whole communities of alien life.
Crawling across the ocean floor were thin and spindly creatures that bore a distant resemblance to pycnogonids, more commonly known by the misnomer "sea spiders". Their branching limbs made slow and jerky motions as they picked their way across the seafloor. Waving majestically in the background were what look like simple corals or sponges. Tiny radially-symmetric plankton-like organisms drifedt in the plumes of hot water, and tunicate-analogs clung to the rocks.