"What Hides Beneath" is the eighth episode of the first season of the TNT science fiction drama Falling Skies, which originally aired July 31, 2011.The episode was written by Mark Verheiden and directed by Anthony Hemingway. Colonel Porter returns to the 2nd Mass and informs them that not only has the 7th Mass been destroyed, there has also been no contact with the 4th and 5th Mass. Weaver orders Tom to scout out the massive Skitter structure and determine how best to destroy it.