NORAD, what's the situation?
( NORAD ( , ( what ( ( 's ( the situation ) ) ? ) ) ) )
(ROOT (SBARQ (NP (NNP NORAD)) (, ,) (WHNP (WP what)) (SQ (VBZ 's) (NP (DT the) (NN situation))) (. ?)))
I already know the details of what is happening. 
( I ( already ( ( know ( ( the details ) ( of ( what ( is happening ) ) ) ) ) . ) ) )
(ROOT (S (NP (PRP I)) (ADVP (RB already)) (VP (VBP know) (NP (NP (DT the) (NNS details)) (PP (IN of) (SBAR (WHNP (WP what)) (S (VP (VBZ is) (VP (VBG happening)))))))) (. .)))