Hammering heard in new video of prison escape by 'El Chapo'

MEXICO CITY (AP) — New video reveals hammering sounds several minutes before Mexico's most notorious drug lord escaped from his prison cell through a tunnel. 

The closed circuit prison video broadcast Wednesday by Televisa shows a longer segment of surveillance on Joaquin "El Chapo" Guzman on July 11 than what the government previously released.  It also includes sound. 

Guzman can be seen lying on his bed under a blanket watching television when the hammering begins.  A split screen with the prison control room shows no one reacting. 

FILE - In this file screen grab of video from a security camera, dated July 11, 2015 and released by Mexico's National Security Commission, shows the man Mexican authorities say is Joaquin "El Chapo" Guzman, pacing inside his cell at the Altiplano maximum security prison, shortly before escaping through a tunnel below the shower area, top right, in Almoloya, Mexico.  A new closed circuit prison video broadcast Wednesday, Oct. 14, 2015, by the Mexican television chain Televisa, reveals hammering sounds several minutes before the country's most notorious drug lord escaped from his cell through a tunnel. ( Mexico's National Security Commission via AP, File)

Even when Guzman disappears into the tunnel in the floor of his cell's shower, there is no visible reaction in the control room.  Twenty-five minutes pass before two officers gather in front of screens and talk.