The party will not notice that a huge iron
grate could fall from above at this point in
the corridor. The underside is even with the
tunnel ceiling 15 feet above, and is painted a
grayish brown to blend with the stone. The
trap's two triggers are false doors, described
as area 28 but located separately.

26a. The secret door (detectable at normal
chances) leads to a winch, which is used to
haul the grate back up. The lowered grate
cannot otherwise be raised unless three or
more individuals with ogre strength (18/00)
all work together to do so.

>> 27.