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A vacuum in a tube that has to pull a "car" across the Atlantic would have much greater outside force of pressure than an aircraft has inside "cabin" pressure. So of course the tunnel would be more robust, that does not change the fact that it is more vulnerable to hostile intentions than an aircraft. and I never said that the security at the stations would be less stringent that that of an airport! I was saying that that security pretty much ends after the station once the tube descents into the depths of the ocean.