Thanks to Andréa for this subtle groaner:
Sources say that either the exclamation “Great Scott” is not attached to any particular person with that name; or else may be associated with Sir Walter Scott, or with U.S. General Winfield Scott. But here, with the talk of Antarctica and the South Pole, surely they intend some kind of glance at famous and unfortunate polar explorer Robert F Scott?
And another from Andréa, who calls this “Barely an oy”. Also fodder for you dialectologists out there.