Roof Fall in 1st West at the Intersection of #6 Entry and XC #23. It is about 38' L x 19' W & domed up to 19.5' H. Water is pouring out of 2 places & dripping in others. It appears the excessive water pressure caused the strata to fail. No injuries or entrapment. Three ventilation stoppings were damaged. New Primary & Supplemental Support was installed.