A little more info below. $1T and 50 years to complete.
From a geopolitical point of view (e.g. I don't like SA that much but understand our need as frenemies ... in the short term), I hope it's a colossal failure and money pit. As a sci-fi fan, I'm kinda rooting for it.
https://www.aljazeera.com/news/2022/...craper-in-neom