[2] During the period of 1977–1984, a Special Handling Unit (SHU) operated at Millhaven, alongside its general maximum-security population.

[3] A new Canada-wide Special Handling Unit was subsequently opened in Sainte-Anne-des-Plaines Quebec, and the Millhaven SHU was closed.

Ranges are double-sided and have hydraulically locking metal doors (See video in "External Links" section), housing two inmates per cell.

MAU (Millhaven Assessment Unit) formerly housed inmates recently sentenced to federal time, in the Ontario region.

A new 96 bed facility was constructed within the Millhaven compound, to house inmates from the Kingston Pen closure.

A 1.2-metre (4-foot) "warning fence" inside the perimeter of the exercise yard acts as a boundary that inmates cannot cross without deadly force being used.

Armed patrol vehicles with Colt Canada C8 rifles and parabolic microphones are on guard at all times.

[20] On 10 December 1971, the Millhaven guards were brought to trial with Knight serving as the Crown's star witness.

[22] Two Millhaven guards, Bernard Evans and Grant Snider denied beating Knight and claimed that he had simply fallen and hurt himself.

Three hundred police officers and soldiers from CFB Trenton created a cordon that eventually yielded the capture of most of the escapees.

[32] In response to the 1976 uprising, a report presented to the House of Commons in October 1976 written by 11 MPs stated: "Millhaven's early history was marked by the use of clubs, shackles, gas and dogs often in combination.

Inmates had fashioned “zip” guns, and had also smuggled a number of .22 rounds into the prison to aid in their escape, which ultimately failed.

On July 5, 1985, the warden of Millhaven (Al Stevenson) was placed under police protection due to credible threats to his life.

[35] In 2004, correctional officers employed at Millhaven Maximum Security were concerned about their safety after a rash of inmate uprisings.

[37] On October 12, 2010, a correctional officer with a rifle shot a convict who refused orders to stop assaulting another prisoner in an outdoor recreation yard.

They began to barricade themselves in the area and guards fired shotguns and used chemical agents to gain control of the situation.

[42] August 11, 2014, the Canadian Broadcasting Corporation reported that Millhaven Institution was on lockdown to facilitate a major search.

[44] David Martin, a manager at Millhaven, was arrested in August 2010 and convicted of smuggling various narcotics into the prison, apparently in connection with the Hells Angels.

[45] In late April 2013, the Canadian Press acquired freedom of information documents indicating that Federal Public Safety Minister, Vic Toews overruled the Millhaven warden, who had approved a radio interview with Omar Khadr.

These inmates had been transferred to Millhaven after the closure of RTC (Regional Treatment Centre) at Kingston Penitentiary.

[47] There was also concern by the John Howard Society of Canada that the underground "bunker-like" location was a very negative atmosphere for these inmates.

Stephen Reid (bank robber of The Stopwatch Gang fame) stated that he was told by an aboriginal inmate whilst incarcerated at Millhaven in 1971 that it was built on a native burial ground.