Ich glaub mein Schwein pfeifft - 092 - The Last Caretaker

Hopefully well-prepared, we plunge into the depths of the hole, following the ever-descending torch beam. At the bottom... there's nothing. Disappointed, I'm about to surface when I spot something glowing in one of the walls. A door. Behind it, an airlock and air. Of course, we've swapped the lamp for night-vision goggles and now have to proceed this way. Oh well. Deeper and deeper, winding corridors filled with filth and whistling pipes lead us into secret structures. There we find something like a laboratory where pigs were taught to sing? Finally, we climb back up and arrive at a familiar door.