Model of a 200 - 1800 m dam break at the Nova Kakhovka dam
https://www.youtube.com/watch?v=0tRYWbVD5AE
Al Jazeera: Ukraine shelling damages Nova Kakhovka dam: Russia media
https://www.youtube.com/watch?v=_3GQE6kkuAo
Whether Ukraine is shelling the dam, or Russia is threatening to blow it up. Either way it would literally wipe out all Russian positions in the area.