"It kind of looks like a ship from the Vogon Constructor Fleet that misjudged the distance and slammed into the ocean floor leaving behind its footprint. This probably alerted the dolphins who appealed to the galactic government for a temporary hold on construction of an interstellar bypass through our orbit. The dolphins have since been trying to convince us to contest this construction, yet unfortunately we have misunderstood their intentions".
Could be a lot of things, Hahaha