The First Submarines in the Book of Mormon,

Ether 6: 4,7, 10 and 11 [Book of Mormon]
One might just say read the chapter… here’s a link.
“And it came to pass that when they had prepared all manner of food, that thereby they might subsist upon the water, and also food for their flocks and herds, and bwhatsoever beast or animal or fowl that they should carry with them—and it came to pass that when they had done all these things they got aboard of their vessels or barges, and set forth into the sea, commending themselves unto the Lord their God.”
“7And it came to pass that when they were buried in the deep there was no water that could hurt them, their vessels being atight like unto a dish, and also they were tight like unto the bark of Noah; therefore when they were encompassed about by many waters they did cry unto the Lord, and he did bring them forth again upon the top of the waters.”
10And thus they were driven forth; and no monster of the sea could break them, neither a whale that could mar them; and they did have light continually, whether it was above the water or under the water.
11And thus they were driven forth, athree hundred and forty and four days upon the water.”
I could just take the verse one by one, but I am growing impatient. “Jared is building boats and getting ready to take a voyage. These are the boats He was earlier commanded to make that are as big as a tree. I asked earlier not knowing what the size of a tree was. Now I have learned that they were very large trees. Evidently trees larger than a Seuqoia. As they were not only carrying people, but people and herds and flocks, and all the food that was needed for all, for 344 days, that is just short of a year. This isn’t one or two animals, nor just one flock or one herd, but now we have boats built the size of trees large enough to carry herds, meaning cattle, goats, horses, donkeys, and flocks, sheep. Dumbfounding.
But not only are these seafaring vessels huge, they evidently are the first recorded submarines, and more indestructible than any previous vessels. Their principle mode of propulsion seems to be that of drifting, so it is likely it might take a ear or more for them to make the crossing. Very large submarines, bigger than our modern nuclear subs.