system
Given the following post, respond as if you're commenting on Reddit:
human
[Mad Max 2015 game] what are your theories about where the oceans went?

Is there canon? The films could be set inland, so the freshwater could be gone but the seas remain, but in the game you clearly are driving around on the ocean floor, now turned desert. 

Did the indo-australian tectonic plate get raised above sea-level? If so, how?

Did an a runaway type of technology convert the seas into something else, like hydrogen for fusion? Does that mean there's high-tech societies hidden out there like The Institution in Fallout 4?

Did aliens just suck them up because they're zany aliens?

Is mad max actually set in a mythological location, like purgatory?

What's going on??
gpt
Legends state the ocean dried up, but that's literally impossible. The world apparently is just in the midst of a rampant greenhouse effect, but if it was hot enough for it to boil away we wouldn't be here.

As the legend of Max went on society became more and more tribal and isolated. The story of Max is somewhat limited to the remote Australian Outback, where many if those people have never seen the ocean. To them, under the incredible oppression of the desert sun, it feels impossible for a large body of water to exist. Since many never left their homes around the oasis and slave settlements many just assumed either they never existed or dried up. In reality the oceans are still there, the people of Australia's interior have never been able to get close enough to see it.