Some Of The People [closed]
The sentences you have mentioned in the post literally and fundamentally do share the same meaning, and none of the above is in charge of any grammatical or punctuational errors.
However, speaking of my point of view as a reader, the two sentences (here refers to the 'five people' ones) perhaps do have a slight difference in contention. You are emphasizing 'the five people are not going to come out alive' in the first sentence when you say 'Five people here possibly are not going to come out alive.' whereas the second sentence is implying the possible risk for the people who are considering doing this thing. It is focusing on the hazardousness of which, and the possibility of something unexpected uncontrollably occurring during the experiment or whatever you have mentioned that may result in the deaths of five people.
Even though the two sentences unequivocally mean the same thing, my brain still automatically tells me I am not going to be alive anymore after participating in this experiment or something when reading the first sentence, but I do feel a sparkle of hope when it comes to looking at the second sentence. I reckon this is due to the style of writing as the first sentence has a relatively subjective tone, while the second sentence has a more objective tone which makes the included information more credible and makes people feel less disconcerted. Moreover, the second sentence sounds more ambiguous in its way and which helps reduce people's attention on the estimated number of mortality, so they psychologically forget about the final consequence.
I hope this is helpful! :)