Seven men working on the construction of a tunnel that is part of the controversial project to divert the Acheloos River from western to central Greece had to be rescued yesterday after becoming trapped. The men were penned in when a lorry that was helping to remove earth from the tunnel caught fire in the area of Mouzaki, near Karditsa in western Thessaly. Rescue workers and firefighters were called in to put out the blaze and help the workmen out of the tunnel. The tunnel, which will be more than 17 kilometers long when completed, is one of the three main parts of the project, the other two being the Sykia and Mesochora dams. The diversion of the river has met with strong opposition from environmentalists and residents of western Greece but is supported by farmers in Thessaly who say they need the water for their crops.