In the series Dark, we are already shown that in Adam's world, the Apocalypse of 2020 was triggered by Adam in 1920. When Clausen orders for the concrete section to be busted open, he exposes the radioactive material that is then activated by what Adam and his team are doing in 1920. The end results in the Apocalypse of 2020 in Adam's world.
In Eve's world, we are shown The Unknown entering the power plant and rigging it to create the Apocalypse in 2019. The younger and older self of The Unknown land up in an alternate world power plant and rig something.
My question is: What are the young and old Unknown doing? They have no role to play in Adam world's apocalypse, yet they are there doing something.
EDIT: I'm looking to get answers from the Series and not from the website.