An engineer is hired to plan and oversee the construction of a undersea tunnel between Europe and the US. However, certain interests don't want to see the tunnel built and use every means at their disposal, including sabotage and murder, to stop its construction. French-language version of the 1933 German DER TUNNEL, q.v.

• Jean Gabin
• Madeleine Renaud
• Pierre Nay
• Gustaf Gründgens
• André Nox
• Edmond van Daële
• André Bertic
• Philippe Richard