A Eurotunnel Le Shuttle train from France to England broke down halfway through the Channel Tunnel, leaving passengers stranded deep below the English Channel.
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The New York Times > World > Image > Escaping the Tunnel
Channel Tunnel (Calais/Folkestone, 1994)
Timeline of border tunnels since 1990. - The San Diego Union-Tribune
At English channel tunnel, migrant crisis evolves into a political one – Orange County Register
Train passengers stuck for hours inside UK-France undersea tunnel
eurostar cancellation: Eurostar services resume as cause of flooded tunnel probed - The Economic Times
Passengers stranded for hours inside Eurotunnel