Vaulted tunnel running east-west along the ruined Structure VI
"The masonry [of the passage] is mixed; some stones are carefully worked, others only roughly pecked, and the vault made of large slabs roughly blocked out. A niche in the south wall of the passage is 1.75 m. deep, 96 cm. high, and 60 cm. wide. The side walls are lined with large, crudely worked stones; the back wall is of natural limestone."
(Ruppert & Denison 1943:59)