The bomb had been underneath one of the city's most notorious bars.
The closure of Schwabinger 7 had infuriated many who saw it as a legendary part of Munich's night-life, one of the last remaining dark, scruffy places, where the Rolling Stones used to go drinking when hanging out with Uschi Obermaier.
All attempts to save the bar failed – and the sounds made by late-night boozers was replaced by the rumble of the building being pulled down. Workers with pneumatic drills were hard at work on Monday, while all around them people went about their business in the lively district.
Until a digger scraped against metal on Monday – and work on the site was halted.
Even then Munich bomb disposal officer Diethard Posorski and his colleagues assumed it was a ‘normal' bomb – which although dangerous, can be handled with care.
It took several hours before it became clear that the 250-kilo bomb was not the normal kind; it has a chemical detonator, said Posorski.
“That is a chemical delayed-action detonator. I am not defusing that, I'm not suicidal,” he told the Münchner Merkur newspaper on Monday night.
He referred to the three people who died in Göttingen in 2010 trying to defuse exactly the same kind of bomb, which exploded when they lifted it up a little.
“We also lifted this one up a touch, but thank God, we survived,” he said.
The operation to clear people from their homes started on Monday night at around 10pm and was later extended so that around 2,500 living within 300 metres of the bomb were affected.
They were given just minutes to grab a few things and leave. Officials went door to door making sure everyone had heard and understood the instructions being blared out by loudspeaker.
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Many went to stay with friends while others were put up in a nearby school where Red Cross volunteers tried to make them comfortable.
Further experts were being brought to the site on Tuesday, and are expected to create a controlled explosion at some time in the evening. A large timber shell filled with straw and sand was being built around the bomb on Tuesday morning to catch shrapnel and muffle the shock wave.