Board Thread:General Discussion/@comment-28172712-20160410032410/@comment-188.67.108.56-20160522130029

Dead zones / hypoxia on the sea floor could make game more challenging. It's the low oxygen areas or no oxygen at all in the bottom waters. Organisms are destroyed due to lack of oxygen, only bacteria survives in the dead zones.

Dead zones are often caused by the decay of algae druring algal blooms, perhaps algae needs to be added somewhere if dead zones could happen. The algae falls to the bottom of water and decomposes by depleting oxygen in water. There is no incoming oxygen anywhere, so it depletes and turns into dead zone.

I don't know how it exactly works, is complicated and i don't know any science vocabulary.

If dead zones can affect the player there could be warning when entering dead zone. Any fishes swimming into it start to suffocate. So basicly it's underwater wasteland, and doesn't support life other than bacteria. There is lots of nitrogen and phosphorus in the water i suppose. Could be toxic too.