The Tunnel

Brilliant engineer who spearheaded the Channel Tunnel project and became a global celebrity. His work consumes much of his personal life, creating distance from his wife Ruth and their son Geoffrey. Driven by passion for progress, he persists through setbacks and personal loss to push the project toward completion.

A member of the financial circle backing the project; a pragmatic operator who represents the investor side of the venture. He helps maneuver support and keep the media and public engaged as the plan faces delays and dangers. His role highlights the pressure from financiers on technical ambition.

Partner of McAllan who contributes the radium drill technology and scientific know-how. He shares the burden of the project’s risks and remains a steady technical ally as difficulties mount. Robbins embodies the collaborative side of innovation, balancing ambition with technical prudence.

Wealthy sponsor and central financier whose backing is crucial for the tunnel. He uses his resources to attract investors and drive the project forward, embodying the power behind large-scale engineering dreams. His strategic vision is tempered by the tensions of alliance and control among stakeholders.

Lloyd’s daughter, secretly in love with McAllan. Her affection becomes a catalyst in the funding dynamics, as she uses personal leverage to influence decisions and secure continued support for the project. Her involvement adds a romantic and political layer to the enterprise.

McAllan’s wife, who retreats into caregiving and motherhood as their life unravels. She loses her sight due to gas exposure among the workers, and later returns to reconnect with her husband as the crisis deepens. Ruth’s struggle reflects the personal costs of a high-stakes pursuit.

The couple’s young son who is exposed to the tunnel project’s dangers; his fate becomes a powerful motivator for perseverance. Geoffrey’s tragedy underscores the human cost of engineering hubris. His loss drives McAllan to push forward with renewed resolve.

A maternal figure within Ruth and McAllan’s circle, representing the domestic and emotional strands that accompany the project. She embodies steadiness and resilience in the shadow of corporate and personal turmoil. Mary’s presence adds a quieter counterpoint to the film’s grand engineering narrative.

The American chief executive who publicly champions the tunnel as a symbol of unity and peace. He represents the political payoff of transatlantic collaboration and the optimistic rhetoric surrounding such a monumental project. His leadership frames the project within a broader vision of international harmony.

The British head of government who endorses the tunnel as a marker of national strength and a bridge to postwar cooperation. He engages with American leadership to align goals and reassure the public about the project’s ambitions. His role highlights the political stakes and international diplomacy surrounding the venture.

An arms manufacturer whose greed and appetite for power threaten to manipulate the project for personal gain. He embodies the corrosion of integrity when profit motives override public good. Grellier’s confrontations with other stakeholders intensify the plot’s risk and moral questions.

Lloyd’s ambitious associate who manipulates stock and ownership interests to control the tunnel. His hunger for authority makes him a principal architect of the project’s financial peril. He ultimately meets a violent end as the scheme unravels and loyalties shift.