It still remains possible that this was a US operation, possibly a secretive one, that has gone very badly astray for one reason or another. But given the denials, this is looking less and less likely.
The possibility that this was an enemy is too mindboogling to even speculate on at this point.
If something went wrong on a US boat, I mean I just do not see that as likely. It takes the whole crew working together to launch those birds. It never can happen on accident. If an accident did happen it would be catastrophic, and send the boat down like the Kursk in Russia.
A secretive Op would have a cover. There is no cover here other than “we don’t have a clue”? Oh no no no no Mommy isn’t buying that.
The pentagon knows, and isn’t at all interested in admitting it knows a damn thing. WHY?