&gt; think about massive tsunami (at least that&#x27;s what I would expect, depending on the impact force of course)<p>You&#x27;d need something way more powerful than the Tunguska event; ignoring that Tunguska was most likely an airburst (not an impact), its estimated yield was about twice the Castle Bravo yield which did generate relatively inconsequential waves compared to the rest of its issues.<p>A &quot;true&quot; tsunami requires absolutely ridiculous amounts of water displacements, that doesn&#x27;t happen with anything short of existential-risk impactors. Operation Hardtack confirmed that nuke-level energy didn&#x27;t come close: there isn&#x27;t enough displacement <i>and</i> that displacement is very temporary.