down are located at 21n 0e (yes, another level).
this one is easy. from the entry go south. keep going until you get down to 0n 0e. now go east to 0n 10e, then go north to 2n 10e. turn east, go through the door, turn south, and go through the door. follow the hall to the end, and go through the door on the east wall at 3n 13e. go south until you reach 0n 14e, then turn east. keep going east until you reach 0n 21e, then start heading north until you get to 10n 21e. go through the secret door located on the west wall. after going through 