New discoveries from space give experts new clues in the hunt for Jack the Ripper. When a strange object crash-lands in Antarctica, experts speculate it could be an alien visitor. Cutting-edge tech helps experts answer these sinister mysteries from space.

A site that could be the Garden of Eden hides a deadly secret. When a gateway to hell suddenly opens, experts investigate where it leads. A mysterious shipwreck could be an infamous Soviet KGB pirate ship.