England is on an island (Great Britain), and France is on the mainland of Europe. There is no other rail route between England and France. It doesn't 'save' any distance as their is no alternative.
The Channel between England and France is very shallow. It is much less than any sea. Definitely less than one mile if you are using the Channel Tunnel.
There is the English Channel between England and France which is 21 miles at the closest point. You cannot drive between the two Countries but you can drive onto a train which takes you through the Channel Tunnel.
It is 31.4 miles if you travel via the Channel Tunnel. At its closest point, the French coast is only 22 miles from the coast of England.
Eurotunnel is the company which owns and operates the Channel Tunnel between England and France.The Channel Tunnel is 50.5 Km (31.4 miles) long, of which 37.9 Km (23.5 miles) is underwater.
From Calais,France to Dover,England, its around 26 miles.
Since the assumption of this question is the English Channel connecting England with France, the answer to how far below sea level is the channel would be 24 miles under sea level at the deepest point of the channel.
Eurotunnel is the name of the company which owns and operates the Channel Tunnel, as well as other business interests.The Channel Tunnel is a 50.5 Km (31.4 miles) from end to end, of which 37.9 Km (23.5 miles) is underwater.The Channel Tunnel connects the United Kingdom and France. It runs between Folkestone in Kent and Sangatte near Calais in Pas-de-Calais.
The English Channel is between England and France.
The English Channel is an arm of the Atlantic Ocean that separates the island of Great Britain from Northern France and joins the north Sea to the Atlantic. The English Channel is the body of water between England and France. There is a tunnel underneath it for trains, it is referred to as the Channel Tunnel or the Chunnel. The English Channel is a strait of water that runs between England and France. About 30 miles wide, but as less as 21 miles at it's narrowest point between Dover and Calais. It has been the place of many crossings, many battles and much history.
The Channel Tunnel is 50.45 km or 31.35 miles.
The channel lies between modern day England and France. It is about 350 miles wide.
The driving distance from London to Calais, France (east terminus of the Channel Tunnel) is 108.5 miles. Other locations in France are farther, e.g. Paris is 290 miles and Toulouse is 705 miles.