Sea monsters, surviving in the ice-cold waters of the ocean bed. Ancient predators that have adapted to life in an unexplored part of the Earth. The ultra-modern Neptune 1 submarine mysteriously disappears during a scientific expedition to one of the most mysterious places of the Pacific Ocean, the Mariana Trench. The military elite urgently assemble a crew of top professionals and send them on-board the improved Neptune 2 on a rescue mission into the hell of an abyss. During their horrifying journey in the icy waters, Captain McMillan’s crew face unexpected challenges and reveal shocking truths.Originally published in Bulgarian.