Right, it’s pretty much exactly like the Channel Tunnel…connecting the heartlands of two advanced industrial densely populated regions together. Next, can we start working on a bridge to connect Greenland and Iceland?
Screw that. Greenland needs a giant causeway to Newfoundland first. Then we new-worlders can wrest control of the lumpfish supply from the wily Danes!
Be careful what you wish for. Here’s Drain the Oceans a novel experiment in bridge-building between continents via other means.
Anyone thinking they’ll be wresting control *from *the northwestern Europeans turns out to be sadly mistaken. 
Why it seems like a wonderful, and totally legitimate business investment opportunity!!
Now I know what to do with that windfall I’m expecting to arrive from Nigeria any day now…
Inquiring minds have already addressed that proposal; consensus was that it’s even more difficult (and economically impossible) than a Bering tunnel.
See Under the Sea, starting at posts 33 and 40.