So we learned at the end of the finale that Polis crumbled into ruin, blocking acces to the Second Dawn bunker. Clarke also survived thanks to nightblood and has found a girl (who is nightblood too) She also lost contact with Bellamy and the others. Finally, we see a space ship with the label "prison ship" landing on the ground. Who do you think is inside that ship? Personally, I think they belong to the Second Dawn and they lived all this time on mars what about you?