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you could use a submarine to detect the wave and see if is coming a tsunami

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There is a moat to trap water and to reduce damage caused by it.

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Justin Wood

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I placed sirens for those who can hear and flashing light for those who are death

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it keep the water back and make it smaller with the mote and smaller with the hole if the wave is too big so it will make it small

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The gray part is the wall that protects high traffic areas, and the blue is the water on the other side. The walls would be placed in one area to make a fully tsunami safe area for people to retreat to or the walls would be placed around big cities where lots of people live.

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On the  top there a moat  and sirens to warn and reduce damage  and on the bottom  there's  a drone to watch the waves and a small  submarine to watch tectonic plates.

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Gustavo Souza Bonfim - Ideas Brainstorm_L1