system
Given the following post, respond as if you're commenting on Reddit:
human
[MCU/Eternals(spoilers)] So, the ending of Eternals....

What kind of ecological disaster does a giant stone head poking out of the Indian Ocean cause? I don't think this was touched on at all in the film but something that massive has to displace a lot of seawater. Wouldn't that basically rewrite coastlines all over the world? That's not even taking the resulting tsunamis into account.  It is not a very happy ending for a lot of people.
gpt
The resulting tsunamis are going to be a big deal, but Tiamat was already in the Earth. They didn't add volume to the system; every cubic meter of them now in the ocean is a cubic meter of rock that's fallen deeper into Earth's mantle/core and offset the displacement.