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A search and rescue helicopter was seen flying over Dover Harbour after it was feared a man was in trouble in the water.
The Coastguard received a report he had gone missing while swimming just after 4.30pm.
Members of the public, Dover RNLI and the local coastguard all took part in the search.
The man managed to swim to shore himself and was found in town safe and well by harbour board police just before 5.30pm.