Is it accessible to the public? Of course it is, just the same as the centre of the Atlantic is accessible; you've just got to address the logistical issues of getting there.
Its just a patch of (frozen) ocean outside of any country's territorial waters, so nobody has jurisdiction over it. You will,of course, have to comply with the entry regulations of whichever country you decide to embark from.
Don't forget your bear repellent.