The Europa Conundrum

In 2020, a Russian scientific submersible, DSV Chilingarov, went missing under the ice at the North Pole. 30 years later a distress signal was picked up from the research base on the ice moon Europa. It has been positively identified as originating from the Chiligarov. The International Space Agency have sent a team to investigate. What will they find? Turn up and find out.