The Red Sea has been a major shipping route since the Bronze Age and Iron Age, ancient Egyptians are the earliest people known to have explored there. The Red Sea became more important after the construction of the Suez Canal in the 19th Century. Through the Suez Canal the Red sea connects the Mediterranean to the Indian Ocean.
The story of how the Ancient Israelite supposedly crossed the Red Sea is like other Myths and it's just typical Mythology. There's no evidence that crossing ever happened or that Moses was what the Bible claims.  Still people with Faith believe what they were taught to believe when young.