How are scientists certain that Megalodon is extinct when approximately 95% of the world’s oceans remain unexplored?

Question

Would like to understand the scientific understanding that can be simply conveyed.

Thanks you.

In: 5134

Answer 1

I have a follow up question: how was the coelacanth *missed* for so long? I believe it was thought to have gone extinct in the Cretaceous, and that’s a long time to have gone missing from the fossil record. Have post-Cretaceous fossils been found since its rediscovery?