Eerie mysteries lurk beneath the waves. Recent discoveries have challenged what we thought we knew about the seafloor. Strange structures litter the deep—from a Baltic anomaly that resembles a crashed UFO, to an enigmatic road in the Bahamas that resurrects suggestions of Atlantis. What other oddities swim in the unmapped darkness below? 

Professional explorers use cutting-edge sonar and robot subs to uncover the ocean’s hidden past. But secret forces seem determined to conceal the truth. Equipment fails, funds evaporate. Some believe shadowy bases dot the seabed—each hiding explosive revelations. Will disclosure ever surface? Or will the aquatic aliens that occupy these aquatic lairs continue to elude our grasp? What will it take to part the murky veil?