This supposedly will be an epic one.
Baalbek
Baalbek supposedly was an ancient high civilization city and might have some connections with ancient Egypt and Babylon.
Baalbeck: The Anunnaki’s City and Afrit Undergound
https://www.goodreads.com/book/show/9459777-baalbeck
I suspected there were few similar "temples" submerged under the sea.
The Peripheral was a good hint, like it! -Seems to be somehow visionary, thanks!
Maybe I can get even by returning a little bit of hotstuff, too. This cave researcher from Austria, Prof. Kusch is his name, found interesting artefacts in an underground facility, dating back more than 60k years. The artefacts not only show a new pre cuneiform proto-writing, but also depictions of what appears to be aliens and ufos. He also found aluminium alloys and technical stuff in the same archeological horizon. Kusch had his carbon datings counterchecked by six different institutes and universities. And this is only a little part of the whole story. The Templars knew it, the church covered it up and more... There is nothing about this in English yet, so far as I know. But you can use Gtranslate or (much better) this KI tool https://www.deepl.com/translator#de/en/
https://coronadatencheck.com/dr-heinrich-kusch-unterwelt/
Here is an intro video in English to Kusch, but witout his latest discoveries:
Here is the real stuff, but in German (automated subs, English translation possible)