The bottom of Chesapeake Bay was mud, at the point described. But if the bottom of the Yam Suph was rock, or gravel, or coral reef, or even firm sand, your objection fails. Don't argue from an incidental point in an imperfect analogy.
In fact Exodus makes it very clear that the surface that the Israelites walked on was the bottom of the Yam Suph, laid bare and dry by a strong wind. The timing was miraculous, of course, and perhaps the wind strength was as well. But there is no indication that there was anything miraculous about the surface, or that it was any drier than would be expected from the sea water receding from it.
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