Having already identified all sites bordering the Arctic, Indian and Pacific, it would be allright of course to also have an 'Antarctic Ocean' connection.
But where does it start, and what are its borders? Wiki
has an interesting background story to tell, but also mentions that there is more than one point of view of what exactly is part of it. "South of 60° S latitude" is the one Wikipedia uses.
Sites that have been suggested are:
Carlton Exhibition, Tasmania, McDonald, Macquarie, Sub-Antarctic Islands
But neither are south of the 60° .
So I think I would have to reject this connection, or rephrase it into another one that encompasses this group of sites.