Not generally.
There have been special exceptions, such as cyclists for promotional purposes, Top Gear Magazine driving it in an electric car, and behind the scenes tours for journalists. If your train happens to be involved in a fire or breakdown (more details on this incident), you could find yourself there, as the service tunnel exists for evacuation purposes.
There have been occasional rare opportunities for members of the public to visit, such as a 2013 tour for European Heritage Days; a video described that as the “first time Eurotunnel has opened its doors to visitors,” and there doesn’t seem to have been another such event since.
Credit:stackoverflow.com‘
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