What do you do once you’ve climbed to the top of the App Store with one of the most popular apps in the past decade and spawned a Star Wars spin-off, countless toys, and even a film? For Peter Vesterbacka, the marketing chief who oversaw the expansion of Angry Birds until 2016, you build a tunnel. One that’s mostly underwater and costs $18 billion, according to BuzzFeed News, which published a profile today of Vesterbacka’s costly effort.

More specifically, it’s supposed to be an 80-mile-long tunnel and a high-speed railway between Helsinki in Finland and Tallinn, the capital of Estonia. (The idea for connecting these two countries dates back to 1871, BuzzFeed notes). Vesterbacka first broached the idea when he approached Estonia’s…

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