I don't know what to say about this creature. The expedition staff on our cruise had never seen an octopus in Antarctica. This one was in the shallow water near Port Lockroy. If you have any ideas on what species it is, please let me know. I saw this octopus in the swallow water of Port Lockroy. (Photos courtesy of Glen Gould.)
The octopus swims away.
NOTE: After first posting this, Dr. Brian Grieg Fry (http://www.venomdoc.com/) suggested "Little hard to tell from the photo, but based on your description of size (most Antarctic specces are quite small), I’d say most likely Megaleledone setebos They get much larger than that."