Your Brain Has Tunnel Vision

| Friendly | July 28, 2016

(I’m taking a train to Paris with some university friends and I overhear a couple of them pondering how they could build a tunnel underwater. Thinking they’re asking about the difficulties of building under the sea bed I lean over and begin to explain the process, before one of them interrupts…)

Friend #1: “But wouldn’t all the water just flood in?”

Me: “Well, it does flood but they pump it out and seal up as they dig.”

Friend #2: “How do you dig through water?”

Me: “You don’t… You dig down and go under the sea bed. Same principle as digging the Tube under the Thames.”

Friend #3: “Yeah, but that’s on land. How can you dig under the sea?”

Me: “The channel’s only about 60 metres deep. You dig down to there, go across and then dig up.”

Friend #4: “Wait. There’s land under the sea?”

Me: “…yes.”

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