Polar Night & Day Question

I think I see where you are going with this. Bouvet Island is just off Antarctic. The events in the movie were set in February. (The dialouge from scene opening the sarcophogus confirms this). The southern hemisphere is summer at that time of year. A location of that latitude would experience extremely long days at that time of year, however, any outside scenes where shown to be in complete darkness. Well spotted snorkel.

Without the need to go too much into explanations, which might sound boring or unclear, a simple consideration can be done. Bouvet Island is in the southern hemisphere and has a latitude of -54.4 degrees, so day and night there work exactly like any place at +54,5degrees (therefore in the northern hemisphere, which most of us are more familiar with), except for the inverted seasons. Inhabited cities in the northern hemisphere roughly at that latitude are the ones in northern England and Northern Ireland, for example. So day and night cycles on Bouvet Island are comparable to those of, say, Belfast.

so no polar night/day/twilight effects then?

No polar days/nights for sure.

Thanks Nox