This is great though ironically one of the less humane ways to utilize prison labor. To be entrusted with work like that you'd have to have a decent record for

This is great though ironically one of the less humane ways to utilize prison labor. To be entrusted with work like that you'd have to have a decent record for a criminal, for example serving for a less serious crime or have made good progress in rehabilitation. But the work is more grueling and dangerous than most other kinds of prison labor.