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Home Folkestone News Article
One of the workers was in a serious condition, French officials said on Sunday, but all those affected have now been released from hospital.
The first incident happened as some 60 workers were changing rail tracks on the line between Calais, France, and Folkestone, UK on Saturday night.
A welder was taken ill in the early hours of Sunday and carbon monoxide poisoning was later diagnosed.
Tunnel traffic was unaffected.
Eighteen other workers were also taken ill after it appeared the carbon monoxide detectors inside the tunnel failed to register levels were dangerous.
They were all sent to local French hospitals to give them "the time needed to remove the carbon monoxide from their system", an official said, adding their condition was not a cause for concern.
The 41 other workers went home.
An investigation has been launched into the cause of the incidents.
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