They ate whatever provisions they brought with them. Other than fish, seals, or penguins along the coast, there is little food in the Antarctic. On the Roald Amundsen trek that first reached the South Pole, the explorers ate the sled dogs that they used for dog-power (they pulled the sledges).
Another simultaneous attempt by Robert F. Scott ended in tragedy when food and fuel ran out, and all five of the group that reached the Pole died, including Scott.
Food brought by the explorers to Antarctica included tinned and dried foods. The main food source, however, was pemmican, a 50/50 mix of lard and ground meats.
Yes, they were Antarctic explorers.
Antarctic explorers were outfitted in layers that included cotton, wool, canvas and animal fur. Their boots were lined with a type of straw, to separate their feed from the ice.
boats and dog sleds
Extremely cold temperatures, mostly.
they traveled on sledges with dogs pulling them
There are no lemmings in the Antarctic.
resourceful, confidence, courage, bravery, determination
People interested in exploring the Antarctic continent approached it by ship, then once on the ice, walked in order to explore.
They eat fish.
All polar explorers between about 1899 and 1922 -- the Heroic age of Antarctic Exploration -- traveled to Antarctica by sailing ship.
Foods included dried and tinned foods, plus the mainstay: pemmican. Pemmican is made 50% from lard and 50% from ground meat. As well, early explorers also ate penguin eggs, penguins -- which they found to be greasy, and seals.
All Heroic Age Antarctic explorers, including Sir Douglas Mawson, sailed to Antarctica on hull-reinforced ships.