News ok article about shelters ...above ground shelters and safe rooms survived.
http://newsok.com/oklahoma-tornadoes-aboveground-shelters-stood-up-in-face-of-ef5-moore-tornado/article/3840636
http://newsok.com/oklahoma-tornadoes-aboveground-shelters-stood-up-in-face-of-ef5-moore-tornado/article/3840636