The Mystery of Al Capone's Vaults starring Rob Black as Geraldo Rivera.

From wikipedia:
http://en.wikipedia.org/wiki/The_Mystery_of_Al_Capone's_Vaults

When the vault was finally opened, the only things found inside were dirt and several empty bottles including one Rivera claimed was for moonshine bathtub gin. Despite the ending, the special became the most-watched syndicated television special with an estimated audience of 30 million. After the show, Rivera was quoted as saying "Seems like we struck out".[1] However, in his 1991 autobiography Exposing Myself, he wrote, regarding the event, "My career was not over, I knew, but had just begun. And all because of a silly, high-concept stunt that failed to deliver on its titillating promise."