With the sky and space already conquered, scientists busy with subterranean exploitation

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Theres no doubt some developed countries have already developed subterranean transport channels with roads and railroads stretching for hundreds of miles under the earth’s surface. Tunnels have been in existence for many years but most of these have been done to go through hills. With the increasing pressure on the preexisting surface and aerial transport routes, I have no problem learning of efforts by scientists and engineers being busy to come up with underground transport routes to ease movement.