Macau plans underwater casino
Macau is expected to surpass Las Vegas as the world's biggest gambling market in 2005, with the territory's casinos projected to bring in more than $5 billion in gambling revenue as newly affluent mainland Chinese flood to Macau to gamble.
Ref. https://edition.cnn.com/2005/TRAVEL/05/17/b...o.ap/index.html
I don't know if it is a fair comparison to make between Vegas and Macau, seeing that the number of people that have easy access (non-air) to Macau is significantly higher than those who have access to Vegas. Las Vegas is primarily a US target, and while it does draw a large non-US clientele, it will still be the main gambling attraction in the US, unless gambling is made legal in more states. Macau is accessible to all of Asia. I may never visit Macau's casinos in my lifetime, but I'll surely be to Vegas a couple of times.