"Drowned God"'s concept centers around the idea that human history has been manipulated to cover up certain facts. The true history, according to the game, is that aliens from the Orion area of space seeded humanity on Earth thousands of years ago and have since guided its development. An ancient, highly developed civilization was lost millennia ago in the Great Flood. The library of Alexandria housed much of what game writer Harry Horse called "forbidden knowledge" before it was destroyed; the Knights Templar, whose membership included luminaries such as Leonardo da Vinci and Isaac Newton, preserved the information for centuries. In the 20th century, the Philadelphia Experiment opened a gateway into another dimension, first freeing the aliens Horse refers to as "the Legion", and an independent government group spent the subsequent decades in contact with the aliens following the Roswell incident.