Realistically, for a turtle of this size to exist, the ocean in which it swims would need to be several orders of magnitude larger than anything known on earth. I am unable to access any satellites which may be orbiting the planet, which would allow me to make a rough estimate.

[The curse of being technological in nature. Bladewolf relies on technology for everything.]

I have, yes. The welcome information was most informative, but has done little but raise more questions.