Shipping to Antarctica
Given the Antarctica has no permanent residents, there is not a whole lot of shipping that goes to the continent. That being said, there are about five thousand people that come and go from the icy continent on any given year. They are typically held up at any of a few dozen research stations scattered around the local. If you were thinking about shipping there, it would probably be in conjunction with one of these research posts so talking to one of the research teams or hosts would be the best place to start to figure out logistics on shipping something there.
Security concerns when shipping to Antarctica
The main threat to the security of your items when shipping to Antarctica will be due to the climate and the hostile environment both in route, and on the continent itself. It is because of these harsh climates (which have gotten down to one hundred twenty nine degrees Fahrenheit below freezing as a point of reference), that you will want to monitor what you are trying to ship there. Anything that can freeze and crack should not be sent, or anything that will spoil with extreme cold weather conditions. If you have any questions about whether your shipment is appropriate to ship there, you should discuss it with your shipper for their advice on the matter as opposed to just shipping it and taking a gamble.
Transit times when shipping to Antarctica
Given that you will be at the mercy of when a research teams resupplying source decide to ship to Antarctica, you will probably not have that many options as far as transit times to Antarctica. Also, it will be by ocean cargo freight liner or another type of sea vessel that your goods would be shipped there so speed is not necessarily going to be on your side in this department.