I can't quite believe this is true but apparently, a tunnel has been built from London to New York, so that, using optical devices, you can see from one end to the other. I thought this may be an April fool joke at first, but it's May, so that's unlikely! Interesting website here
ADDENDUM
Turns out nights must have affected my brain! The Telegraph puts a more likely theory, being that the "tunnel" is actually a broadband connection between London and New York. Sad in a way - all the mystery is now gone!
