Must have been the Hole In The Wall gang!
German police baffled as robbers cut through 3ft thick concrete to steal $15m
Robbers tunnelled 100 feet underground and through three feet thick concrete walls to break into a bank’s strong room, stealing money and valuables estimated to be worth more than 10 million (£8.3 million). Police were left stumped when they discovered the giant hole cut through the wall with what appeared to be four cylindrical devices at the Volksbank in the western Steglitz district of Berlin, Germany.
Have to give them 10 out of 10 for patience and persistence. That must have taken them a while.