A migrant who made his way into the Channel Tunnel got blocked in a service room along the way. The Nord Littoral tells the story on page 3:

“Once on site, the forces of order start their inspection on foot of the 17 km — a forbidden area — of the tunnel, helped out with a slow-moving train. Once he is found, the migrant takes shelter in a service room, where he cannot hurt the operation and safety of the tunnel. A decision is then made by the prefect and the police to leave him locked in that room to allow the traffic to resume, before going in, probably at night, at a less busy time, to arrest him.”

He stayed there all day long and faces a 3 year sentence for trespassing and disrupting traffic in the Tunnel.