Channel Tunnel, also called Eurotunnel, rail tunnel between England and France that runs beneath the English Channel. The Channel Tunnel, 50 km (31 miles) long, consists of three tunnels: two for rail traffic and a central tunnel for services and security.

Yes, but it’s not called a “subway” in the sense of an urban metro system. The correct term is the Channel Tunnel (often nicknamed the Chunnel).

It is a 31.4-mile (50.5 km) undersea rail tunnel that connects Folkestone, England, with Coquelles, France, beneath the English Channel.

Here’s what runs through it:

1. Eurostar Passenger Trains: High-speed trains that carry passengers between London and cities like Paris, Brussels, and Amsterdam. This is the service most like a “subway” for intercity travel.
2. Le Shuttle (Eurotunnel): A car, coach, and freight truck shuttle service. You drive your vehicle onto a specialized train in Folkestone and drive off in Calais, France, about 35 minutes later.
3. Freight Trains: Dedicated trains for transporting goods between the UK and mainland Europe.

So, while it’s not a traditional subway, it functions as a mass transit rail link for people and vehicles under the sea. It opened in 1994 and remains one of the world’s greatest engineering feats.