Monty and Harper stay as long as possible in Arkadia, then drive towards Polis.
When Bellamy, Clarke, Murphy, Emori, then with Echo stucked with their Rover, Monty & Harper are requested to reroute to meet them in the forest. After that meeting this group of now 7 people drive towards Becca's iland to meet Raven.
Only Monty was near the bunker when Jaha and Monty did sucessfully open the bunker.
But Harper was never near Polis and never near the bunker.
1st prove: Harper in fact NEVER in Polis therefore never in the bunker
2nd prove: Monty and Harper were NOT on Clarke's list of 100 Skaikru members
(Jaha was preverred over Monty as engineer, Harper has a genetic sikness)
Jaha and Kane did not made any own decision but simple executed Clarke's list. We can safe assume that Niylah under protection of Octavia took the place of Bellamy - this gives one free spot as Clarke is not present her self.
Please provide episode number and minute where Harper can be seen in the bunker?
Harper was there after the bunker was open again in season 5. She was there for some episodes like The Warriors will where She and Monty saved Indra, Bellamy and Gaia from the fighting pits by reviving the plants in the Hydro Farm, which was later burned by Octavia. You can check Second Dawn Bunker where Monty and Harper have a section
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