No question in my mind. Has to be Giovanni Falcone in Palermo in 92. Used 400 kilo's of explosives under the motorway. Toto Riinas men carried out test drives, using flashbulbs to simulate detonating the blast on a speeding car, and a concrete structure was specially created and destroyed in an experimental explosion to see if the bomb would be powerful enough.
I think there is nothing near the planning and detail in that offered up yet. That was military precision.