France and Britain spent six years tunnelling beneath the English Channel until both sides met 40 metres below the seabed in 1990, creating a 50.5-kilometre rail link between Britain and Europe.

The Channel Tunnel, a major engineering feat, linked Britain and mainland Europe. This project culminated on December 1, 1990, after years of digging. Engineers used advanced surveying and laser guidance for precise alignment underground. The tunnel now provides a reliable transport route regardless of sea conditions. It significantly changed transportation and trade across the continent.