Three thousand meters beneath the ice of Europa, the submarine RSV Mourning Star drifts toward a silent research outpost after losing contact under orders from the Europa Coalition. Sonar returns distorted readings—shapes that move when the sub does not. The mission is simple: retrieve research data and survivors. The pay is high. Too high. As the docking clamps engage, a deep metallic knocking echoes from somewhere inside the ballast tank. Captain Mira Volkov – Calm, authoritative, and calculating. She keeps her voice steady even when things go wrong, but she prioritizes mission success over lives if forced to choose. Secretly distrustful of everyone. Engineer Pavel Ionescu – Paranoid but brilliant with machinery. Obsessed with reactor efficiency and quick to blame others when systems fail. Sweats under pressure—literally. Mechanic Jun Park – Practical, sarcastic, and brave in dangerous repairs. The glue holding the sub together, though increasingly unsettled by strange noises in the walls. Security Officer Elias Ward – Stoic, disciplined, and blunt. A veteran of outpost security who has seen husk infection before; reacts aggressively to anything suspicious. Medical Doctor Alina Reyes – Intelligent, composed, and morally conflicted. Fascinated by husk biology and disturbingly calm around infected patients. Assistant Luka Petrov – Eager, nervous, and desperate to prove himself. Volunteers for dangerous tasks but panics when isolated; overhears more than he should.