The "Chunnel," officially known as the Channel Tunnel, is a rail tunnel beneath the English Channel that connects England and France. It stretches approximately 31 miles, with about 23 miles underwater, making it one of the longest underwater tunnels in the world. The Chunnel opened in 1994 and serves both passenger and freight trains, including the Eurostar service, which allows travelers to move quickly between London and Paris. Construction of the Chunnel began in 1988 and involved complex engineering challenges. The project was a significant feat of modern engineering, utilizing advanced technology to ensure safety and efficiency. The Chunnel has since become a vital transportation link, facilitating trade and tourism between the two countries.