There are no self-sustaining Arctic settlements - i.e. Ones that grow their own food locally without hunting and without getting regular air drops, generate their own electricity, de-salinate or thaw their own water etc, create their own fabrics and building materials, and have some options to create their own microprocessors if needed. Oh, and that can launch its own rockets to space.

Musk is purportedly dreaming of a colony on Mars that would survive if the Earth were destroyed. That means that not only do they need to grow food, get water and generate electricity from Mars, but they will also have to have the manufacturing capacity to make everything from tunnel boring machines to microprocessors. An actually self-sustaining colony on Mars would likely have to be closer in size to a large city on Earth than to a permanent base in Antarctica.