25 Ocean Mysteries Science Still Can't Explain

The ocean covers most of our planet, and most of it has never been seen. In this feature we go through 25 real, documented ocean mysteries that science still can't fully explain: ghost ships found with no crew, ships that vanished without a trace, sounds louder than any known animal, sunken cities, and structures on the seafloor no one can account for. From the RMS Waratah and the Franklin Expedition to the Bloop, Point Nemo and the Baltic Sea Anomaly, these are the cases the deep has never given back. Best watched with sound on. Visuals are AI-generated.