Will you hit Antarctica before shabbos? Any way to set up a Tchum to allow a disembarkation on shabbos?
Would be a shame if after everything, there was only Sunday and Monday to be able to actually spend time in Antarctica.
That's the best case scenario at this point.
You need to board a zodiac to reach land, don't think that's allowed on Shabbos. Same goes for reboarding on Shabbos.