Mysterious sea monster appears in British tourist’s holiday photos

Yet, if one goes and does 15 minutes of online research, you find that you can eliminate 95% of possibiliities, and once you have your choices down to one, the answer can only be that it is X, or it new creature Y. So then what are the chances of a brand new species of dolphin/whale living in the waters off of Greece? Maybe one in a million? Where are the rest of them, then? There has to be a breeding population, right? At least a couple dozen... yet we only have the one photo. Or... we can see from the deion of a beaked whale that their appearance is highly variable.