Proof of sub-basement explosions at WTC

On 9/12/2001, Peter Jennings interviews Marlene Cruz, a carpenter injured in one of the pre-collapse explosions in the WTC sub-basement level B long before the planes hit the towers. The first casualty of 9/11 admitted at Bellevue Hospital, Cruz is a living witness who proves that pre-planted explosives were used to weaken the foundations.