. >> reporter: martin horn former commissioner of the new york city department of corrections an expertat happens inside prisons. >> it could be over the years the guys have been in prison they worked on a maintenance detail prisons use the prisoners to maintain the prison everything from painting the balls to fixing the leaks to rewiring an electrical socket. and so they may well have actually been in the pipe chase area that everybody seems to be so fascinated with. >> reporter: this is far from the first time an inmate attempted a daring prison escape. take what happened in one oklahoma prison in 2013 when four inmates plotted an escape through the jail bathroom. they unscrewed a metal plate on the shower ceiling. they then hoisted themselves up to a crawlspace. just five feet tall and three feet wide. one by one they followed the jail's plumbing system. at the end of the pipes, authorities say the men had knocked holes in the concrete they dropped through those holes to the ground floor and walked right out the door. >> this is a door that they actually came out of. >> reporter: or

. >> reporter: martin horn is a former commissioner of the new york city department of correction an expert on what happens inside prisons. >> it's spiral possible over the years these guys have been in prison that they worked on some sort of a maintenance detail because prisons like clinton use the prisoners to help to maintain the prison. everything from painting the walls to fixing the leaks to rewiring an electrical socket. and so they may well have actually been in the pipe chase area that everybody seems to be so fascinated with. >> reporter: the prison's isolation giving it the nickname "little siberia." once home to famous inmates like lucky luciano, and tupac shakur it is located 20 miles from the canadian border where authorities are also on the lookout. >> they should stop them at the border. so no way of getting worried more than we have to. >> reporter: in fact police are following up on over 600 tips. from as far away as philadelphia. >> they could either be four miles from the prison or they could be in mexico. you just don't know. >> reporter: for one convict's mom, t

former new york city department of correctional director martin horn. >> until they have these two guys cornered they're circling everyplace else. eventually they're going have to come up for food for water, for something. >> reporter: it's very quiet here now but that's the nature of these manhunts. officials have to respond to any kind of credible lead and check it out thoroughly. meanwhile authorities admit these two men could be anywhere. jeff. >> thank you very much. >>> this morning the obama administration is retooling in its battle against them. major garrett is at the white house with this new approach. major, good morning. >> good morning. president obama intends to send hundreds of more military adviser sa advisers into in western section. now, the plans which could be unveiled officially as early as today call for sending upwards of 500 more advisers to augment the 3,000 u.s. troops in iraq now. all the u.s. troops would remain under the same strict military guidelines. no frontline advising or intelligence gathering to minimize the risk of combat deaths or capture. the pres

former new york city department of corrections commissioner martin horn. >> until they know for certain they have these two guys cornered, they are continuing to search every place else in the state and outside of the state. eventually they'll have to come up for food for water, for something. >> reporter: it's very quiet here now. that's the nature of these manhunts. officials have to respond to any kind of credible lead and check it out thoroughly. meanwhile, authorities admit these two men could be anywhere. jeff? >> the obama administration is retooling its strategy in the fight against isis in iraq. the new plan calls for hundreds of new military advisers and another base to train iraqi troops. the goal is to retake ra mehdi. major garrett is at the white house with this new approach. >> reporter: president obama tends to send hundreds more military advisers into iraq into the western section known as anbar province. that's where isis terrorists have made recent and unnerving military gains. the plans which could be unveiled as early as today call for sending upwards of 500 more ad