WATER BUILT UP BEHIND A SET OF SEALS AND #5 SEAL BROKE THROUGH AND WATER RAN TO OUTSIDE IN #3 PORTAL. NO WATER WENT TO ACTIVE SECTION. ALL U.G. POWER WAS DENERGIZED AND ALL MEN REMOVED FROM MI NE BY 8:20 AM 0.2-0.3 CH4 WAS DETECTED @ #6 SEALONLY MSHA WAS NOTIFIED AT 8:30 AM.