Engineers have raised the two vessels, which sank to the bottom of the River Yare between Reedham and Berney Arms in an operation lasting two weeks that cost £72,000.

The incidents happened just 1.5 miles apart and are among several wrecks on the waterways, which are causing rising costs for the Broads Authority, which is responsible for recovering sunken vessels.

A 66ft boat sank near Polkey's Mill, followed by a second vessel near Berney Arms on the River Yare within weeks of each other (Image: Google)

La Bergere, a 66ft houseboat, which has a heavy concrete-filled steel hull, sank near the historic drainage mill, Polkey's Mill,

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