Iron Lung

to be on them, leaving behind an empty universe of asteroids and lifeless moons where the only remnants of humanity are those who were on space stations or starships at the time. With supplies gradually dwindling and infrastructure falling into disrepair, the survivors have spent the subsequent years frantically searching for any trace of remaining natural resources. Up until now they have been unsuccessful... Then, a mysterious anomaly known as a Blood Ocean (which is exactly what it sounds like) was discovered on an otherwise barren moon. It's not the first Blood Ocean found since the vanishing, but initial scans show a collection of potentially useful anomalous locations in a deep undersea (underblood?) trench that require further investigation. And you're the unlucky sap who gets to investigate, in an aging submarine cobbled together from rusty space station parts. Find your way to the marked locations, photograph whatever you find there, and try to finish before the sub collapses around you... or you're discovered by whatever lurks in the blood...