John Massey is understood to have hid in the prison's gym yesterday until he could sneak on to the roof and escape over the wall without being stopped.
It is thought his makeshift rope was made from bedsheets.
Pentonville was described by prison inspectors as one of Britain's most challenging jails to run last year, but the inspection also found "no obvious problems with physical security".
More top news
Matt Hancock believes the devices can have a “real impact” on pupils’ achievements.
Court of Appeal judges in London will review his 30-year jail term for sex offences against boys he coached between 1979 and 1991.
Brexit and security, cannabis law and children’s mobiles dominate the papers on Wednesday.