Two prison inmates in Ohio committed a slew of stunning crimes from behind bars using contraband computers that they’d hidden in the ceiling.

Inmates Adam Johnston and Scott Spriggs got their hands on parts to build the two computers through Cleveland nonprofit RET3, which provides the machines to Marion Correctional Institutions, Green Initiative program for inmates to disassemble.

A 50-page report from the Ohio Inspector General found that the duo hid the computers “on a plywood board in the ceiling above a closet in a training room” and that the computers were connected to the Ohio Department of Rehabilitation and Correction’s computer network.

Johnston and Spriggs used credentials belonging to retired ODRC employee Randy Canterbury to access the internet, the report says.

Investigators found that the computers contained a “large hacker’s toolkit with numerous malicious tools for possible attacks” and that the two inmates saved articles about “making homemade drugs, plastics, explosives and credit cards.”

They also downloaded porn, newly released movies and TV shows and disseminated them on thumb drives to fellow inmates in exchange for commissary items.

Johnston and Spriggs also applied for five credit cards in another inmate’s name – and forged passes for prisoners to gain access to multiple areas within the medium-security jail.

Authorities grew suspicious after ODRC officials got an email alert saying a computer network with Canterbury’s log-in credentials had “exceeded a daily internet usage threshold.”

The computers were found in July 2015 and Johnston later admitted they’d been in place since before June.

The Inspector General’s Office ultimately found the jail’s lax security standards allowed Spriggs and Johnston to go undetected and that it didn’t properly report the incident.

The office is now calling for the jail to review its policies and procedures.

It’s unclear whether Johnston and Spriggs will face additional charges.