For Once, Legit Laughing at the Daily Fail...

 ...for the phrase "Sharkcano' and a discussion of mutant sharks living in an acidic underwater crater.

I want this movie.

Hunting down a more reputable source, it appears the Daily Fail may not have invented it.

But the volcano concerned is Kavachi and it provides habitat to silky sharks and hammerheads...who may or may not be mutants, but are certainly living in a harsh environment. These sharks are not dangerous to humans, but if they're mutants?

It writes itself.

Most likely the sharks will have some kind of ancestral memory of the last eruption and go hang out somewhere else for a bit. Sharks are pretty smart fish.