In the "good ending" where you sacrifice another passenger to save Timmy, you just doomed somebody else just like you were doomed. Throughout the map you can find pieces of other survivors like the grave on the beach with the picture of armsy. So there was somebody before you likely somebody from the Sahara organization or just a random survivor. So the theory is that the survivor before you sacrificed you to escape or well activate the artifact since it requires a human sacrifice. So if u chose that ending you just continued the cycle and as we all know the human instinct for survival well more love towards someone since u sacrifice somebody else to bring back Timmy. What if the next passenger had someone who they loved and wanted to bring them back to so if he did the same it would just be an infinite cycle.