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2 answers

they are made by "boring" under the sea bed.
take a look at
http://en.wikipedia.org/wiki/Tunnel

2007-03-25 03:52:05 · answer #1 · answered by purimani2005 4 · 0 0

They are not constructed through the water, there would be to much pressure.
They dig them through the ground under the water.

2007-03-24 05:44:08 · answer #2 · answered by Anonymous · 0 0

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