Eight years after their ship crash-landed, the colonists from Earth have learned to survive on another world.

Despite the relative harmony of the colony, Galena remains a treacherous place. The oceans are ruled by massive aquatic beasts that restrict the survivors to their farms and the lands beyond - where other dangers lurk. A chance recovery of multipurpose space suits in a salvage crate and an unnatural tunnel leading away from the colony unlock a pathway to exploring the forbidden oceans, where an amazing discovery awaits.

But the only revelations do not come from below. A glint of metal in the sky heralds a new arrival. A ship has come at last... but why?