A prison escape (or prison break) is the act of an inmate leaving prison through unofficial or illegal ways. Normally, when this occurs, an effort is made on the part of authorities to recapture them and return them to their original detainers. Escaping from prison is also a criminal offense in some countries, e.g. United States and Russia, and it is highly likely to result in time being added to the inmate's sentence, as well as the inmate being placed under increased security. Aggravating factors include whether or not violence was used.
Many prisons use security features such as motion sensors, CCTV, barred windows, high walls, barbed wire (or razor wire in some countries) and electric fencing to prevent escapes.
Numerous methods have been used to escape prison over time. Many escapes have been successfully conducted by inmates who have invented their own methods. Weaknesses that are found as prisoners escape are often corrected at numerous prisons around the world to prevent future escapes in a similar manner. This leads inmates to finding new ways.
Since prisoners usually have a lot of time in which they are doing nothing, this gives them plenty of time to think, allowing them to devise plans and figure out ways to escape.
The following are methods that have commonly been used by prisoners in escapes. In some instances, a combination of these are used.
While some prisoners are allowed out of their cells at times, others remain locked in their cells most of the time. Many prisoners who are kept in their cells must find ways out of the cells. Even those who are allowed out of their cells at times still have plans that involve escape from their cells.
Cell escapes occur through either the door, the window, the light, the ventilation system, by breaking down the walls, or by tunneling underground.
Some prisoners have escaped by picking the locks on their cells, creating keys to their cells, sawing bars off of the doors or windows, carving away the walls, or breaking away the vent.
Breaking down or slipping through the physical containment of the prison, including that of the cell itself and/or the surrounding complex. Methods include destruction of the cell or compound walls, squeezing through tight spaces, or entering off-limits areas. Prisoners often destroy their containment with homemade tools, smuggled objects, or other contraband.
Most prisons are contained on the outside by one or more fences, often topped with barbed wire or razor wire. Escapees manage to scale these fences successfully or cut holes in the fences, damaging them. These fences are also watched by one or more guards from a tower, but escapees manage to pass the fence when the guard is turned away, unable to see in the dark, or sleeping on the job. Outside the fences is often a perimeter patrol conducted by an officer in a vehicle, which stands as the final line of defense. Escapees manage to evade this by studying the length of time between passes and/or waiting until it is on the other side and/or using the cover of darkness.