I'd like to work in Antarctica for a year. Anyone here working in any of the limited opportunities there? How did you get in?...
You are far more likely to work there for a few months over the austral summer. A full year would mean overwintering.
I am not sure who has the contract these days, but ITT Antarctic Services used to provide the hired help for the United States program. If you want to get the full experience, however, I would try to tag along with a research group, or an engineering group that needs to get out "on the ice" to support them.
I first went to Antarctica as a prospective graduate student, but that was some years ago when the arrangements were much more informal. For example, we got the keys for Scott's and Shackleton's huts from the New Zealand base commander and spent a pleasant afternoon checking them out as part of testing our sledges and snowmobiles.