In a ceremony presided over by England’s Queen Elizabeth II and French President Francois Mitterrand, a rail tunnel under the English Channel was officially opened, connecting Britain and the European mainland for the first time since the Ice Age.

The Channel Tunnel, or “Chunnel,” connects Folkestone, England, with Coquelles, France, 31 miles away. The Chunnel cut travel time between England and France to a swift 35 minutes and eventually between London and Paris to two-and-a-half hours.

As the world’s longest undersea tunnel, the Chunnel runs under water for 23 miles, with an average depth of 150 feet below the seabed. Each day, about 30,000 people, 6,000 cars and 3,500 trucks journey through the Chunnel on passenger, shuttle and freight trains.