Hi guys! Managed to start my new year with a blocked outside kitchen drain. Skimmed through many forums in search for an answer. My main struggle is understanding how the drain works as I am seemingly unable to figure out w h e r e the water is supposed to escape. I attached a drawing of my current understanding of it, together with a photo i took from inside the system, showing the end of the pipe that runs from kitchen, outside into the drain. I've tried rods that barely fit, plenty of hours of caustic soda - nothing but frustration. The house I live in was built around the seventies or eighties i believe. Does anyone perhaps recognize the system and is able to point me to what am i missing there?