In the depths of the water there are bacteria, animals etc, so would animals would have survived then as they were so deep underwater
Swarm poisoned the seas, but some bacterias might survive in such a situation.
Tardigrades
And how they poison see
I know their name but I couldn't spell in your language. Also, I am not sure about how they poison the seas but it should be told at datapoint "Banda Sea Incident".
What do you think?
