Re: Cut off the UK?!?!
Psssst! Don't tell anyone, but all our communications links with that there Yrup are also via under-sea cables....
Nope, they are not.
If my memory from my telco days are right, most of the capacity from the UK to the continent is dual route. One route is ALWAYS under the sea - North Sea or Channel. The other route is USUALLY the Channel Tunnel (sometimes an alternative sea route). So on that side usually only one is under sea.