The ocean is deep, dark, and full of mysteries we may never solve. From lost cities beneath the waves to ships that vanished without a trace—these true stories will leave you questioning what lurks in the deep.In this 4+ hour deep-sea mystery documentary, we explore real unsolved ocean mysteries, including the Yonaguni Monument, ghost ships like the MV Joyita, the Ningen, the Devil’s Sea disappearances, and the mysterious sounds of the Mariana Trench. From sunken lost civilizations to strange underwater creatures and legendary vanished vessels, join us as we dive into the deepest, strangest mysteries of the ocean.