Lurking in our oceans are creatures that defy explanation. See more in Season 14, Episode 5, "They Came from the Sea." Watch all new episodes of Ancient Aliens, Fridays at 9/8c, and stay up to date on all of your favorite shows on The HISTORY Channel website at http://history.com/schedule. ...

Is a strange sound traveling through 5,000 miles of ocean proof that the prehistoric Megaladon is still alive? See more in Season 1, Episode 5, "Deep Sea Sounds and Phantom Ships." #TheProofIsOutThere Watch all new episodes of The Proof Is Out There on Fridays at 10/9c, and stay up to date on ...