Margaret Thatcher and François Mitterrand shook hands, marking a monumental moment in European history as they signed the agreement to build the Channel Tunnel, a 31.4-mile undersea passage connecting England and France. This ambitious project, dubbed the Eurotunnel, would take nearly six years to complete, demanding meticulous engineering and sheer determination. The tunnel would revolutionize travel, commerce, and cultural exchange between the two nations, forever changing the face of Europe.