Do you really believe this was built 2500 years ago?
No? Okay, I'll step backwards with a few suggestions and you tell me when to stop … which date would stretch your credibility too much?
Remember, this is a major work of engineering. This is not a couple of islanders with chisels in the off season working at this like a hobby.
250,000 years? When it was originally started, say, then added on over countless thousands of years?
If you found out what they based their estimate of 2500 years on you would realise they are just making it up … because they don't know.
Funny that, always these deep refuges like the one on Malta … an island separated from the mainland to protect from slave revolts … deep underground with religious temples and chambers. Oh, that crazy Tex, he sees melonheads everywhere … unless like Tex you know they already found melon skulls on Kish the same as they found on Malta. I do believe that I am one extremely well-read nut.