hmmm... that could be fun actually!
I had a look at a comment on the adrants site, and this caught my eye:
This is possible too, isn't it?

According to Engineering Professor Harland Joffrey-Wistbommer from the Institute of Applied Natural Sciences & Transportation in Brugge, Belgium the media got this story wrong insofar as there will NOT be a tunnel built. In fact the New York to Paris train will be more of a high speed submarine, utilizing what is now known as Captured Aeration Propulsion (CAP) wherein a liquidynamic/aerodynamic submersible (the "train") is encased in a constantly replenishing giant bubble of air that envelops the submersible for its entire length, effectively removing the resistance presented by water and allowing the submersible to move in air. This technique is already successfully used on some major cargo ship hulls. Though not tested to its extreme limits the new technology will allow almost any size object, including a specially designed train, to travel at speeds in excess of 350 km/hr underwater effectively making the journey from New York to Paris in under 8 hours. Initial activity will be centered on the Atlantic ocean only as warmer Pacific waters seem to have a delitirious effect on the technology. Talks have started with Britain, Holland and Denmark to add them to the delivery chain.
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