Diver Finds Structure on Ocean Floor — Then Finds Out Why It’s There

Tip of the iceberg

Inside, the water grew darker and colder. The outer room that was visible above the ocean floor level was cramped and empty, just a wide entry hall with layered stone walls. But Eli could tell this wasn’t it. This small section above the seabed was just a mask—the building was only the tip of a much larger structure, most of it buried beneath layers of sediment and time.