1213 GMT October 28, 2021
The hunt was prompted by a call to the coastguard from a friend of the swimmer on Monday, BBC reported.
A helicopter and lifeboats were launched as part of the rescue effort, and the man was eventually found by a boat just 500 meters off the coast of Dover.
The swimmer was brought to shore and was described as "cold and tired".
The rescue operation began just after midday.
A coastguard spokesperson said: "At around 12:10 p.m. HM Coastguard received a call from a member of the public with information that their friend was swimming unaccompanied from Dover to Calais.
"Coastguard rescue teams from Deal and Langdon, The Royal National Lifeboat Institution (RNLI) lifeboats from Dover and Dungeness and coastguard search and rescue helicopters from Lydd and Lee-on-Solent were sent.
"Vessels in the area were asked to keep a sharp lookout and Kent Police, Dover Port Police and Dover Port were informed.
"The swimmer was spotted shortly before 8 p.m. by a passing vessel only 500 meters off Dover and was taken onboard the RNLI Dungeness lifeboat, cold and tired but otherwise well.
"He has been brought to shore and checked over by South East Ambulance Service."