2 per rev, just for qualification, and not to take away from the rescue, I calculate Invercargill (not the southern most point in NZ) 369 nautical miles from Campbell island.
a) I wonder if they had fuel at Campbell island
b) and why they only got an aircraft from the north island
Quite a few 350's in the South Island last I checked, some good pilots in InverVegas too (did my 206 training there, of all places)
Some of those crazy cats were landing on icebergs nearby recently (<25 mile ofshore) - should make them
certifiable to do a trip to Campbell Island