Eugene,
Regent can't do any shore visits in Antarctica because of very strict environmental rules. There are no docks or places to get off a tender and in fact zodiac landings are wet landinge (you step off into the water.) You need to go on the Minerva, Hanseatic or one of those expedition ships to get on land. There is a lot of concern about cruise lines like HA, Princess, Regent etc doing cruise by visits to the area because if there is any problem requiring a rescue there aren't eny ships in the area large enough to collect the passengers and crew.
Jim