Shineskai: Into the Depths

The land has been covered with ice, forcing mankind to take refuge in the ocean. Years have passed, but the all-consuming ice moves slowly but steadily on, and civilization has fallen into decay. One lone survivor lives on in solitude. Desolate days lead into aimless nights, and the Aquanaut passes the time in rote repetition. But one day, a chance encounter leads to the discovery of a mysterious drone-like machine. Source: The Game Website.