At Point Nemo, the most isolated place in the Pacific Ocean and a vast graveyard for spacecraft, a mysterious structure of unknown origin is discovered in the depths. The crew of the experimental submarine Andromeda is sent to investigate it, but the expedition also attracts Black Manta and Aquaman. When the structure begins reacting to their presence, scientists, heroes, and criminals find themselves confronted by a force they do not understand. Isolated on the ocean floor, they must face both the physical dangers of the abyss and their own fears, while the mystery reveals unexpected connections to Atlantis.