(S (S (NP (BASENP (NNS Stowaways)) (PP (IN in) (BASENP (NN wheel) (NNS wells)))) (VP (VBP risk) (S (VP (VP (VP (VBG freezing) (PP (TO to) (BASENP (NN death)))) (PP (IN after) (BASENP (NN take-off)))) (CC or) (VP (VP (VBG being) (VP (VBN crushed))) (SBAR (WHADVP (WRB when)) (S (BASENP (DT the) (NNS wheels)) (VP (VBP retract))))))))) (PERIOD .))