Secrets of the Underground - Season 2 - Eps 7: Lost Pirate City Treasure
When an infamous pirate city sunk into the sea after a massive earthquake, a pirate's treasure might have disappeared with it. Rob Nelson and Stefan Burns use cutting-edge technology to hunt for the legendary lost pirate treasure of Henry Morgan.
About Secrets of the Underground

Title: Secrets of the Underground
First Air Date: 2017-02-14
Last Air Date: 2017-12-16
Status: Returning Series
Rating: 4.3/10 (from 3 votes)
Language: EN
Seasons: 2
Total Episodes: 16
Network: Science
Genres: Reality, Documentary
Production Companies: Science Channel
Synopsis
A search for an underground escape route said to have been used by Al Capone. Also: who or what built earthen mounds in Washington state.