If it was scientifically possible to become a mer, would you?

[Tiefenrausch]

I prefer to be underwater. The surface world is too noisy.

Then I'm sorry to inform you that even though water tends to drown out more high pitched frequencies, sound travels way further underwater. The myth that the ocean is silent, especially in the shallows is exactly that, a myth. There are fishes who are so noisy, especially when trying to find a mate, that it tends to confuse the sonar of ships in the vicinity