IRA prisoners’ escape from Mountjoy Prison by helicopter

The IRA prisoners’ escape from Mountjoy Prison by helicopter was a striking prison break that altered the calculations of republican prisoners elsewhere. In late October, a hijacked helicopter landed in the yard of Mountjoy Prison in Dublin long enough for IRA leader Seamus Twomey and two associates to climb aboard. The escape became both an example of what an audacious operation could achieve and a warning that authorities would respond with tighter precautions.

Background and Precedent

The escape occurred amid continuing efforts by the IRA to free imprisoned leaders and members. Its method was conspicuous and direct: rather than conceal a prisoner in the ordinary traffic leaving a prison, the operation brought an aircraft into the prison yard. The helicopter stayed only long enough for Twomey and his associates to board, making the brief landing itself the decisive opening.

The Escape

In late October, the hijacked helicopter appeared over Mountjoy Prison and touched down in the yard. Twomey, described as an IRA leader, and a couple of his associates climbed aboard. The episode is recounted as one of the Provisionals’ most audacious escapes to that point; the account supplies no further detail about the aircraft, the planning, or the escapees’ route after takeoff.

Consequences and Significance

The escape emboldened Brendan Hughes and fellow republican prisoners considering how to get out of Long Kesh. At the same time, it made prison security more pressing: the account presents the Mountjoy operation as a precedent that encouraged escape planning, while explaining that Hughes and his comrades knew security would be tight. Their own contemplated method—a ride beneath a refuse lorry—depended on intelligence about the guards’ checks, and the contrast underscores how one successful escape could inspire another without making its methods readily repeatable.