Oh, wait, sorry. He discovers a hole in the wall through which Robbins has escaped. Robbins has in fact spent his decades in jail meticulously chiseling himself an escape route in preparation for one day becoming a heavy handed metaphor for the human spirit.
The Real Life Event
On December 15, 2007, the cells of Otis Blunt and Jose Espinosa were opened at New Jersey's Union County Jail and found to be curiously lacking in Otis Blunt and Jose Espinosa. What the cells did have were two posters of what the newspapers called "bikini clad woman".
The prison guards looked behind the posters and discovered a hole linking the cells to each other and another hole in the external wall, linking the cells to the outside world.
The two inmates had spent the previous weeks chiseling away at the wall with a length of wire. They then crawled into one cell, covered the holes with the posters and piled blankets under their bed sheets to make it look like they were sleeping, an idea so rudimentary, they had to steal it from a Baby Sitter's Club novel.
They then escaped through the hole, climbed a fence and parted ways, one of them going to Mexico City, as in every jail break film ever, the other going to hide in a nearby basement, as in being a fucking idiot.
Not that it mattered; the guy in the basement was caught a month later, the criminal in Mexico the day after that, presumably while sanding his boat on the beach.
They were brought before a judge and charged with third-degree escape, to which they hilariously pleaded not-guilty. We don't know if they were convicted or not, but we expect the prosecution's evidence was along the lines of: "Here is the defendant in Mexico City, here is an empty fucking jail cell. The prosecution rests."