Saudi Arabia Wants to Build a City in the Ocean

The water stagnation problems they will have with that design will be absolutely astronomical unless they have since revolutionary tech that hasn't been mentioned yet. The far side opposite the entrance and the inner sea lanes on the industrial sector will be algae farms. No water circulation, direct sun ALL day, and sea water. Omg the amount of algae they could have literally makes my skin crawl. 

Developments like Dubai's "the world" has struggled with algae over population and its *way* more open than that plan looks. 

There was another city (where exactly escapes me), where they developed a passive system to keep water circulating based on the tides given that it had multiple lanes open at both ends allowing them to cycle the water through. 

There is no apparent option like that with this development. They will have essentially built a giant bath tub of near- stagnant water in the hot sun.. imagine what that water temp will be able to get up to...