There's a new theory among some scientists as to what may have happened during the events surrounding the Israelites' flight from Egypt. The book of Exodus records that the Israelites were pinned against the sea as the Egyptian military pursued them. It appeared as if there was no escape, but then, the record shows, the sea parted as a result of a strong wind, and the Israelites were able to cross over to the other side. The 14th chapter of Exodus says: "And the LORD caused the sea to go back by a strong east wind all that night, and made the sea dry land, and the waters were divided."
When the Egyptians tried to follow them the next day the winds abated and the waters flooded back over them, drowning many of their number.
This video is an animation of what the latest theory proposes. The site of the crossing is at what is called the Sea of Reeds, and it would have taken a wind of about 60 miles per hour to drive the water back:
There's more on this hypothesis in a summary at New Scientist, which is pretty interesting despite the gratuitously dismissive tone of the author's passing reference to the possibility that God was somehow involved.