Are Israeli Hostages Taken by Hamas Being Held in Secret Tunnels?

There's growing concern for the fate of the hostages taken by Hamas. At least 100 hostages, including children, were carried off into the heart of Gaza. It's not known how the hostages are being treated. It's also believed the hostages are being held in the network of secret tunnels under Gaza. Former Israeli special forces operative Aaron Cohen says he's confident that the hostages will come home alive.