>> reporter: norad is marking its 60th anniversary this weekend. it is the only binational command of its kind in the world. but it is not the only tenant inside cheyenne mountain. there are some 15 other u.s. government agencies who operate inside but the officials who took us in wouldn't say which ones. scott mclean, cnn, colorado springs, colorado. >> it is fascinating to get a look inside that facility and the work continues around the clock. for the first time since last month's deadly engine failure, the pilots who safely landed southwest airlines flight 1380, they are now talking about what happened. tammie jo shults and darryn elisor say teamworked help them get through a nightmare that left one passenger dead. >> we had a very severe vibration from the number one engine. it was shaking everything. and that all kind of happened all at once. >> what did you think had