Paris authorities drain the Canal Saint Martin every 10 to 15 years and there are some amazing items that they unearth beneath the surface.
The last time the three-mile stretch of canal was cleaned out, in 2001, more than 40 tons of rubbish was discovered.
Emptying to 90,000 cubic metres of water, and renovating its four double locks, will cost the city 9.5million euros (£7million), and it will remain drained of water for three months.
Employees clutching nets save fish that are trapped in the dregs of the drained canal, to move the fish to their new home.
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