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flow patterns can be seen visually

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Frances Nicolas

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2y ago
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14y ago

You need tunnels in WWII so that the soldiers who were waiting for countries to attack them would have somewhere safe to wait and live for the many months they had to. The tunnels in New Zealand are very secure, on top of the tunnels there is piles of dirt so if grenades went off it would not do any damage to them.

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14y ago

To abridge the circuitous routes

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Q: What Is the importance of tunnels?
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