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1
The ordinary
subaqueous
tunnel
pressure is about forty-five pounds and this corresponds to a head of 104 feet.
2
England already possesses a famous
subaqueous
tunnel
in that known as the Severn tunnel under the river of that name.
3
The greatest proposed
subaqueous
tunnel
is that intended to connect England with France under the English Channel a distance of twenty-one miles.
4
The greatest partly
subaqueous
tunnels
in the world are now to be found in the vicinity of New York.
subaqueous
tunnel
subaqueous