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A lifeguard has described the “unbearable” stench of what he said was raw sewage which flowed on to a Cornish beauty spot beach.
A video showing a slick of polluted water was filmed at Trevaunance Cove near St Agnes on Sunday.
Local lifeguard Joel Henthorn said: “The water was grey and frothing and smelled of sewage.”
South West Water (SWW) said a storm overflow was “triggered briefly” and other factors were also to blame.