Looks like most of them are grouped pretty close around the peninsula. Explains how the volunteers were able to share food between the different international research bases.
[1] https://www.antarcticglaciers.org/antarctica-2/people-in-ant...
Long-distance trips between some of the bases pictured on the link you added are usually not feasible/practical, particularly in winter. We (i.e. Argentinian base) had some longer-distance Twin Otter trips to other national bases, but not that often.
Unfortunately that (and occasional radio darts with SANAE and Showa) was the closest I got to visiting another country's base in my two years.
I was at Halley 5, the remains of which are probably part of a new iceberg: https://news.ycombinator.com/item?id=34578468
Wow, I didn't know a station was on the shelf that broke! Was it ubhabited since long? We also have a couple of stations lost to the elements, Belgrano I and III (the one you overflew surely was II).
Yes, it would have been Belgrano II we flew over. The only other stations I got to visit were some of the other British ones (on the ship in and out) and some of the French subantarctic ones on a later trip.