After the initial explosion, the entire rest of the movie becomes a long and tense sequence of events as the men try to return to Earth. There is a moderate amount of tension filled music throughout the movie. When you feel that thing slide in, and everything's clicking, it's like no other feeling in the world. Jack comes out of the shower and we see that there's a woman still in there. No nudity or activity, though, is seen.
Gene smokes quite a bit as things get tense.
Many people smoke in the background of several scenes, especially in the control room. The Mission Control staff celebrates with cigars. The families of the astronauts must deal with the tension and emotion of having their loved ones in danger. The historical accuracy of the story. NASA and other space missions.