Little need, it's essentially all government run bases down there and they get their internet through various satellite links. You could maybe run one to McMurdo Station since it's on solid land and by a bay but there's just not enough data to justify the cost.

https://en.wikipedia.org/wiki/Amundsen%E2%80%93Scott_South_P...

Datco announced in NPlay Southern Cone 2021 that it projects a 1,026 km submarine cable to Antarctica, through the Drake Pass

https://www.convergencialatina.com/News-Detail/324197-3-8-Da...

I'm guessing there's also not enough people to be worth it. There's only between 1k and 5k people down there depending on the time of year.

The Australian Bureau of Meteorology has pitched building one: https://www.zdnet.com/article/bom-floats-idea-of-antarctic-s...

No. It’s because no one is there.

Only thing more secure than a firewall is an ice wall!