That's mountain level at best lmfao. Imu VAPORIZED AN ISLAND. No nuclear weapon comes close to this kind of power. Even if Meruem is 10x as strong as the strongest nuke, it's still not enough.
what does nuclear weapon have something to do with Meruem ability? i said meruem can rival a powerful nation's fire power, and humanities, strongest weapon are nukes, it doesn't mean meruem destructive scale are like of those.
actually it can be more destructive than nukes, nukes damage only comes with it's after effect .
in the Video meruem wiped out an entire rock, the size of a mountain, and he was only testing Yupi's ability, it was a regular blast.
Meruem can sure destroy an island the size of that, it wasn't big. meruem was indeed continental threat
He can supposely become infintely stronger very quickly, he was born to rule the whole Earth. So yes he can bust an island.