Before coming across the Buddha dhamma, these kinds of subjects are things that I have looked into. For me, I don’t really need or be given much evidence to believe or be open to the idea that there are past technologically advance and ancient civilizations.
I hope the following videos which I just looked up today will help on your endeavor Venerable Sir.
MYSTERIOUS UNDERWATER CITIES DISCOVERED ALL AROUND THE WORLD: ANCIENT CIVILIZATIONS
Forbidden Archeology with Michael Cremo
The second link to the video is a must watch. I only watched 10 minutes of it but it was enough for me. Even for me, it was an eye opener and mentioned things that I didn’t know about and this was only from watching 10 minutes of the video.
DEBATING A BUDDHIST BUDDHIST MONK ABOUT ADVANCED ANCIENT GLOBAL CIVILIZATIONS
Once again I only watched about 10 minutes of the video, but it was kinda interesting that the scientist was actually trying more to validate some of the teachings in the sutta’s on past civilizations than the Buddhist monk. Or that’s what I believe anyways from the 10 minutes that I watched.