It’s just another monster having a swim. Coming up for air.
So the actual real question is why does a skull monster need to breathe air…?
I asked AI, this is it’s response to that:
A skull, which typically has a density greater than water, will still sink even if there is oil in the water [1].
Oil is less dense than water, which is why it floats on the surface. Adding oil does not change the fundamental density relationship between the skull and the water; the skull will remain denser than the overall oil and water mixture and thus will not gain enough buoyancy to float [1].
Ultimately, the key factor in whether an object floats or sinks is its density relative to the fluid it is in.
My theory sounding better
If the police check your search history for any reason you’ll really need to explain why you Googled if skulls float.
I didn’t need AI to tell me that. Or that I was joking.
What search history? 
floatation devices…
AND IT IS LIVE…
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6 watchers including me so far 
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There is a bid now to get things movingbb
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8…