To get near Antarctica while sailing south, you have to first cross what seems like a wide barrier of perpetually stormy seas with huge rogue waves.

In fact, it was in one of these storms that veered more north than usual, that a sailing vessel - can’t remember if it was British, Dutch or Portuguese - got picked up, then tossed and turned for days, and once it was finally over, the crew found themselves in extremely cold seas, very similar to those at northern latitudes.