The convicts doing time for theft, extortion and aggravated assault were able to use an angle grinder and a huge hammer from their prison workshop to break out through a ventilation shaft before slipping underneath a fence to freedom.

A perimeter surveillance camera captured their escape, but wardens did not view the footage in real time and took 41 minutes to sound the alarm.

On Friday it emerged during a headcount that a fifth prisoner, aged 30, had failed to return from day release on Thursday.

And on Monday morning, New Year’s Day, it was learned that two more prisoners had slipped out overnight through a cell window, with one however reporting back hours later.

The pair had been held under an open-prison policy that allows detainees to go to work during the day but obliges them to spend nights behind bars.

“They could have left the prison the next morning by simply walking out through the front door,” a Berlin city administration spokesman told national news agency DPA.

Conservative opposition lawmaker Burkard Dregger attacked the “dilettante” approach of Berlin’s justice minister Dirk Behrendt and called for his resignation.

Behrendt tweeted later Tuesday that one of the initial four escapees had just turned himself in, accompanied by a lawyer, and added that he would “now be transferred to a higher-security prison”.