Probably most of the habitats are domed. We know from Rimward that Nyhavn consists of 4 large domes and Aarhus consists of three. A while back I was running a game that revolved around Titanian University and so did some more research on Titan and came up with some of my own interpretations as well (but bear in mind these are my interpretations and not canon): Being as far our from the Sun as it is Titan has no timezones. The entire moon uses a standard 24 hour clock. Titan is tidally locked and even if it weren't the haze is so thick that it is impossible to see the stars. Simulations based on real time data are projected on most major domes, however, that create the illusion of seeing the stars, spaceships in orbit or on approach, and the other visible moons as they pass by. Atmospheric pressure for Titan is only slightly greater than the mean sea level pressure on Earth. Pressure in domes is kept slightly above that, mainly through extra nitrogen in the atmosphere. As a result dome construction does not need to be as robust as it does elsewhere in the solar system. The slightly higher than standard pressure and nitrogen concentrations can result in short periods of headaches and discomfort for arriving and departing biomorphs. Titanian biomorphs have minute modifications to optimize them for this environment. There is no real game effect for this but an expert examining a morph could tell that it was designed for Titan. Because of the pressure balance most Titanians do not were vacuum suits inside of the habitats the majority of the time. If something were to damage the dome it would result in a slow leak out rather than catastrophic decompression or sudden contamination giving people ample time to get to safety. For trips outside of the domes Titanians often wear haze suits. They are much lighter than standard vacuum suits because of the close pressure differential and are mainly meant to protect against the chemicals of the atmosphere as well as the cold. (I believe Saturn's magnetosphere also provides close to Earth's level of protection from stellar radiation, eliminating or at least minimizing that layer of protection in the suit).