Scuba Diving In China?

It is really easy to lose something in that swamp.
Can any diver help in that case?

I caught myself, that I've never seen prospects of great Chineese resorts with nice sandy beaches and beautiful clear sea for diving.
Well. It would be the same as offering to get in and slide through the sewage pipe and thinking that You are in Aqua Park.
There is a Yellow River. Huang-He. The sea isn't blue either.

I am wondering. Why? Why did nature give eyes to the fish in that area?
It is impossible to see through several centimeters of muddy water.
How does that fish gets oxygen? Muddy water is like dusty air.
So it is probably salvation to get caught by enormous amount of fishermen.

It's interesting. Was it always like that? Or some impact from huge amount of factories exists too?