It’s almost impossible to stop a tsunami, but many things can be done to reduce the damage that they cause. One of those ways is by building huge walls on the coasts. These walls would most likely be built out of steel and would stop the tsunami if the wall is strong enough to withstand it. The problem with this wall is esthetics, It would not look very good and it would limit the room people have to swim. A much simpler solution is to have an alarm system that goes off every time there is a tsunami warning, if something like this was put up at every coastal city, it would reduce the number of deaths from tsunamis. This would have helped a lot in the Indian Ocean tsunami.