When mining the xcut 5 to 6 in 1 R/T, the Roof Bolters detected a 1 foot break - they added extra 5' bolts, when the miner started the xcut 6 to 7, knowing that there was a break at 1 foot only took a 15' lift when the lift was completed approximately 2"" of rock fell, roof started working and caved approximately 6' high - 18' wide - 28' long.