Secret Passage 1 - The Great Hall: On entering the Great Hall located at the left handside of the staircase leading down to the hall, you will notice a brightly coloured light shining through the left-hand side window. Ron will exclaim "Harry, Harry, it's the Hagrid." Hagrid will appear in the Great Hall and show you a secret passage way located under the long table with the mat on top. Climb down.