According to Nahum 1:8, how will God make an end of Nineveh?

Answer: With an overwhelming flood

With an overwhelming flood God will make an end of the city; later the river gates are thrown open and the palace collapses.

“But with an overwhelming flood He will make an end of Nineveh and pursue His enemies into darkness. The river gates are thrown open and the palace collapses.”— Nahum 1:8, 2:6 (BSB)