AN UNINTENTIONAL ROOF FALL OCCURRED AT THE MILLENNIUM PORTAL 4N HEADGATE TRAVELWAY ENTRY #2 BETWEEN 3935N AND 4085N. THE FALL WAS APPROXIMATELY 25-30' LONG, APPROX 18' WIDE & APPROX 8-10' THICK. THE FALL DID NOT AFFECT VENTILATION. THE FALL WILL BE CLEANED UP.