Joseph Fielding Smith ironically answers questions about the literalness of the Flood.
Joseph Fielding Smith, The Signs of the Times: A Series of Discussions (Independence, MO: Zion's Printing and Publishing Co., 1943), 38
A New Heaven and Earth
Now, when Christ comes, we will get a new heaven and a new earth and all of these corruptible things will be removed. They will be consumed by fire; and somebody said, "Brother Smith, do you mean to say that it is going to be literal fire?" I said, "Oh, no, it will not be literal fire any more than it was literal water that covered the earth in the flood."*
*To my great astonishment this has been misunderstood by some, who failed to recognize the irony of this remark. For the benefit of such I will say I do not know of any other kind of water except literal water—H20, the kind we drink, bathe in, and which makes Floods and drowns people. I think fire which consumes will also be literal when it comes. J.F.S.