S3, E1: Sunken ships filled with priceless cargo. Lost cities of gold. Ancient temples concealing untold riches. Are such lost treasures merely the stuff of legend? Or could they actually be real?

S3, E1: Sunken ships filled with priceless cargo. Lost cities of gold. Ancient temples concealing untold riches. Are such lost treasures merely the stuff of legend? Or could they actually be real?