Bible Believers: How was it physically possible for Moses to part the Red Sea?

And why has no one else done it since?
Update: Thanks to everyone for their answers. I find it utterly amusing when asked a scientifically based question, Bible believers will simply say "God did it." Like that proves anything at all. LOL
Update 2: Who really cares if Moses himself parted the sea or god did it? Either way, it's a ridiculous claim.
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