In the biggest safe-opening fail since Gerald Rivera went live inside Al Capone’s empty vault, Jersey City Mayor Steve Fulop today opened up the two long-locked safes inside his office to reveal … an extension cord.

Cue the trombone: Wah-waaaaaah.

Fulop, 36, has been itching to get inside the two safes, located in a closet-sized vault inside the mayor's office, since he assumed office on July 1. With so many of his predecessors leaving office abruptly, he said today, it seemed logical that they might have left something behind.

Alas, there was only a black extension cord with yellow plugs in the smaller safe and the larger one was bare.

“A Geraldo moment,” Fulop cracked.

Rivera is infamous for hosting a two-hour, live television special in 1986 as crews opened Capone's secret vault. There was nothing but garbage inside.

Fulop opened the two safes, made by Hamilton, Ohio company Mosler, with reporters and photographers crowded inside the old vault, now used as a storage closet.

City officials believe the safes were installed sometime in the mid-20th Century, but they don’t know for sure.

On the larger safe is an ad for Mosler, which went out of business in 2001: "Our cash protected day and night by Mosler against holdup and burglary."

Locksmith Elaad Israeli, who unlocked or “manipulated” the safes, said the larger one was “a bit tricky” to get into. Israeli, 30, who helps run Floral Park, N.Y. company Precision Lock & Safe, said he didn’t peek inside when he cracked them.

“That’s what the customer’s paying for, so that they can open it,” he said. “I don’t spoil anything for them.”

Once the safe were open, a reporter asked Fulop if he’ll ever use them.

“For what?” Fulop asked.

City spokeswoman Jennifer Morrill organized today’s safe opening into two groups because there were too many reporters present than could fit inside the vault.

During the second round, Fulop pulled the extension cord out of the larger safe, and cracked the same “Geraldo moment” joke.