The revolutionary bunker-busting ordnance used in a recent strike against Iran’s Fordo nuclear facility was 15 years in the making, Chairman of the Joint Chiefs of Staff Lt. Gen. Dan Caine said Thursday.

Speaking from the Pentagon, Caine said that the U.S. began developing a specialized weapon in 2008, soon after Iran’s ultra secret facility buried nearly half a mile underneath a mountain was revealed.

Caine said that a Defense Threat Reduction Agency (DTRA) officer briefed on the subject quickly determined that the U.S. did not have a “weapon that could adequately strike and kill this target.”

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