At the end of each winter, explosives experts lay dynamite in the icy river that runs through the heart of Ottawa, Canada. Why? And what does this do to the fish?
This weekend, Ottawa's residents must stay a safe distance from the river - it's the annual ice-blasting to prevent melt-water flooding the city.
Since mid-February, specialist workers have been using buzz saws and amphibious ice breakers to cut channels and long grooves in the ice.
The next step is to drill holes, pack these holes with sticks of dynamite, and blow apart the sheets of ice. These mini-icebergs can then float safely down river, avoiding an icy bottleneck around a low bridge.
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