TIL The proposed Helsinki-Tallinn Railway Tunnel, when completed, will be the largest underground tunnel in the world. It will help to reduce time to cross the current Gulf of Finland route from tw...
TIL The proposed Helsinki-Tallinn Railway Tunnel, when completed, will be the largest underground tunnel in the world. It will help to reduce time to cross the current Gulf of Finland route from tw...

Helsinki-Tallinn Railway Tunnel, Gulf of Finland

The 100km tunnel "is expected to reduce the journey time from two hours to 20 minutes."
20 minutes for 100km(60 miles)? That's moving pretty quick.
180 MPH. The train that runs through the tunnel between the UK and mainland EU hits 200 MPH in places.