Low cost, plus a little bit counter-routine.
The anti-routine thing is that these kinds of movies usually have a villain, or at least a bad guy.
And this one does not.
When there must be one person to die, the captain must not die, because she is responsible for the entire ship. If she dies, others may not be able to successfully return to the earth.
Among the remaining three people, the black had tried suicide. Although the Asians were reluctant in their hearts, they were still willing to take the huge risk and the pain of seasickness to save the blacks.
Needless to say, the female doctor is more sympathetic than ordinary people (Hippocratic Oath), and the plot also has a foreshadowing. The old wounds on the black man made the doctor more sympathetic to him.
So the actual detail is that all four of them are pretty good, there are no bad guys, and it can even be said that they are all good guys.
In this sense, some less intense emotional content is explored. It's quite plain indeed, but they are all prerequisites for good people, and it is difficult to really conflict with them.
Also on the premise that they are all good people, compared to other space films, they have a little new idea.
The price is that there are no plot conflicts, no arrests, relatively boring, and lack of a sense of substitution.
The cost is also really low, no action scenes need to be filmed.
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