In memory of Rabbi Levi Yitzchok ben R' Zalman Yuda Deitsch OBM
"Mabul," floodwaters, is a metaphor for exile. The etymology of the word "mabul" is "bilbul" - confusion. Exile is a state of confusion, where everything in the world is not seen as it actually is but rather as a distortion. However, just a the waters of the flood were intended to purify the world, so too the purpose of the overwhelming floodwaters of exile is to purify the world, to bring the world to a state of refinement where there is no potential for any more exile - the true and complete Redemption.
(The Lubavitcher Rebbe, 10 Tammuz 5745-1985)