For security reasons, subterranean runways/airports were proposed
during WW-II. Perhaps the time has come to consider that proposal
again.

Switzerland in the 1970s (and probably before and since) had
underground hangars built into the mountainside. However, the planes
taxied out of them and onto the highway, which became the runway.

all the best -- Dan Ford
email: (put Cubdriver in subject line)

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