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True but still a lot easier....
to destroy than an airway route. However surveillance of a trans Atlantic tube would be nearly impossible and even if so trying to respond to a threat that is a 1000 miles from any shore is all but impossible, there is not enough manpower to respond to a threat, and I am not so sure about it being underground in the Atlantic ocean where depths can reach several thousand meters.
Edited by Tarfu
Updated - 13th Jun