The pair witnessed young versions of each other, opening doors and gazing directly at them inside the vortex.
This suggested there was a multiverse and people could travel between worlds and different time periods.
Just because Tannhaus didn’t figure out how to time travel, it didn’t mean it wasn’t possible.
On the contrary, time travel seemed to exist regardless of whether the scientist invented a machine.
There was the inference perhaps some of the people within these other worlds may have created time travel.
However, there was a level of ambiguity left by the writers of Dark in which fans can speculate about whether time travel still exists.
Dark seasons 1 to 3 are streaming on Netflix now