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Deep in the bowels of Swedish construction giant NCC's Stockholm HQ a dragon is roaring. More than 500KW of diesel power is forcing 200l/min of water through a hardened steel nozzle only 3mm in diameter. Water pressure tops 1,200bar, the jet emerges at supersonic speed, smashes into the chloride ridden 180mm thick concrete floor slab of the basement multi-storey car park - and blasts right through.

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