Or, perhaps the answer is not on land or sea.
Perhaps it is not even here on Earth.
Since the beginning of mankind, we have gazed at the heavens, looking for answers.
Prehistoric man noticed that certain celestial bodies move in orderly and predictable paths, and astronomy, the study of the stars, was born.
Although an ancient science, it continues to give us new discoveries.
One astronomic explanation is that a star in a nearby constellation exploded, creating a supernova. This would have bathed the Earth in deadly cosmic rays.