Why could no water hurt the Jaredite barges?

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Because they were tight like unto a dish

And they were built after a manner that they were exceedingly tight, even that they would hold water like unto a dish; and the bottom thereof was tight like unto a dish; and the sides thereof were tight like unto a dish; and the ends thereof were peaked; and the top thereof was tight like unto a dish; and the length thereof was the length of a tree; and the door thereof, when it was shut, was tight like unto a dish. Ether 2:17

There was no water that could hurt them, their vessels being tight like unto a dish. Ether 6:7

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