(S (S (S (BASENP (DT A) (VBG passing) (NN ship)) (VP (VBD rescued) (BASENP (DT the) (NN 19) (NNS others)))) (COMMA ,) (SBAR (IN while) (S (S (NP (BASENP (DT a) (NN coast) (NN guard) (NN rescue) (NN boat)) (BASENP (PRP itself))) (VP (VP (VBD required) (BASENP (NN rescue))) (PP (IN in) (NP (BASENP (JJ strong) (NNS waves)) (PP (IN in) (BASENP (DT the) (NN region))))))) (SBAR (IN after) (S (S (VP (VBG getting) (PP (IN into) (BASENP (NNS difficulties))))) (SBAR (IN before) (S (VP (VBG losing) (BASENP (NN contact)))))))))) (PERIOD .))