Long tunnel

The Madrid metro system abounds with long walkways between lines. This one from Acacias station on line 5 to Embajadores on line 3. Someone mentioned that Paris is even worse. In both Paris and Madrid, what seems like a simple change between lines on the map can actually mean a 10 minute walk!
I last walked here 4 years ago when I had a class at Acacias. Then the walls were crawling with cockroaches and pools of stagnant water lay around everywhere. An unpleasant place. I was pleased to see it had been spruced up since then!