They were building levees to stop a flood of molten sugar in Sweden last week.
Firefighters also sprayed water to solidify the 38.000 tonnes of sugar that had melted in a warehouse blaze.
The lava-like sea of hot toffee was flowing through Svedala, near the Swedish city of Malmo, on Friday.
Firefighters had to battle the blaze for three days before they could bring it under control, reported wire agencies and the Swedish media.
The molten sugar had spread out as far as 150m from the destroyed store room.
"We're making reservoirs that the sugar can trickle into," a spokesman for the emergency services said.
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