a 30 storey building isn't that big of a wave, being about 300ft. Biggest ever tsunami recorded was over 1700 ft and that was in 1958. There are bound to have been a lot of massive tsunami in varous places throughought human history. And just normal floods of devastation from hurricanes and heavy rain. And then there is the normal much higher sea level experienced during times of warmer global temperatures when the poles are virtually ice-free.
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