>>1706499station walkthrough:
https://youtu.be/sAi_bwcOxG4?t=282 at 4:40
Back in the 2000s when the 2rd line was getting designed, it was supposed to be split-ended see pic rel
But this was mostly an accounting trick in order to extract more European funds because if it was separate they wouldn't get them
Eventually they scrapped the split-end idea but they kept the plans similar, and when building the 2nd line 2010-2014 they made 2nd platform on Stadion Narodowy station
which still stands empty and unused to this day and politicians felt forced to start 3rd line from there no matter what rather than admit they wasted money