Not sure why this 1999 article showed up as a recent addition on the home page, but since it’s there, and I read it, and the inaccuracy at the bottom of the article apparently has been there for 15 years, I might as well comment on it. I appreciated the article, as it corrected my misunderstanding that it was referring to seven actual known seas, and now the symbology of the number 7 makes sense. However, at the bottom of the article you mention " The world was formed in seven days." This is actually incorrect. The symbolism here is 7 represents the completeness of God’s work.
I’ve spent most of my life trying to understand the first two chapters of Genesis. I figure if you understand those fully, you have a leg up on understanding the rest of the Bible. If you examine them carefully, you will see the world was formed in 6, 4 or 3 days, depending on your frame of reference. If you mean “the world (earth) and all the living creatures in it”, that would be 6 days. If you mean “the world sans living creatures (animal, not plant life) but including the sun, moon and stars”, then it would be 4 days. If you mean just “the world (not counting living creatures and the universe surrounding it)”, it would be 3 days. It is interesting to note, God made the “seven seas” on day 3. God’s work was completed by the end of day 6. Thus, he rested on the 7th day.