The idea of linking London and New York with an underwater tunnel has fascinated engineers and sci-fi fans for years.

People have been talking about Hyperloop for years now ... engineers join recovery search for 4 soldiers Every Upcoming Sci-Fi Movie Sequel Releasing In 2025 ...

but as with most conceivably achievable sci-fi tropes, Elon Musk is working on it. Just last week, SpaceX got a permit to begin excavations in Washington, DC for building the Hyperloop ...