Ellen White does not directly state that "millions will die in an instant" with the natural disasters at the end of time, nor does she specifically say that "entire fleets of boats will go down in an instant." However, she does describe widespread destruction, great loss of life, and catastrophic events by land and sea in the last days. Here are some relevant references from her writings:
- She writes of "disasters by sea and by land follow one another in quick succession," with "great loss of life and property" (Prophets and Kings, p. 277.1; Testimonies for the Church, vol. 8, p. 252).
- She describes Satan bringing "disease and disaster, until populous cities are reduced to ruin and desolation," and that "in every place and in a thousand forms, Satan is exercising his power... and thousands perish by the pestilence" (The Great Controversy, p. 589.3).
- She mentions that "storm and shipwreck await those who journey upon the deep" and that "accident and calamity threaten all who travel upon the land" (Testimonies for the Church, vol. 5, p. 234.1).
- In her vivid descriptions of the end, she says, "The sea is lashed into fury... inhabited islands disappear with their living freight. The seaports that have become like Sodom for wickedness are swallowed up by the angry waters" (The Great Controversy [1888], p. 636.3; Spirit of Prophecy, vol. 4, p. 453.2).
While these passages describe massive destruction and loss of life, they do not use the specific language of "millions dying in an instant" or "entire fleets of boats" perishing at once. The language is more general, emphasizing the scale and suddenness of the disasters, but not quantifying the loss in terms of millions or entire fleets.
If you need more specific wording or references, please let me know!
References:
- Ellen G. White, Prophets and Kings, p. 277.1
- Ellen G. White, Testimonies for the Church, vol. 8, p. 252
- Ellen G. White, The Great Controversy, p. 589.3; p. 636.3 (1888 edition)
- Ellen G. White, Testimonies for the Church, vol. 5, p. 234.1
- Ellen G. White, Spirit of Prophecy, vol. 4, p. 453.2