The walkers, who hope to raise at least pounds 50,000, will negotiate vertical ladders, sloping tunnels and weirs by torchlight. In one section they will be just under the M32, and at another 200 feet below the surface.
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Fund-raisers are preparing for a four-mile charity trek along one of Europe's largest sewers. More than 120 volunteers will make the two-hour sponsored walk on Saturday through Wessex Water's newest and biggest foul-water sewer beneath Bristol, two days before the pounds 27m construction opens for business.