Slightly turn left from the place where you're standing and move a little forward. Now, turn left and walk in the passage, till you reach an opened door on the right side and a passage on the left side. Now, turn left and move forward, slightly turn left and move towards the wall. From here, slightly turn right and move to, towards the closed door. Now, turn left and you can see a staircase. Walk through the stairs and stand in the middle of the steps and that is the end point.