(S (S (BASENP (DT The) (NNP MoD)) (VP (VBD suggested) (SBAR (IN that) (S (BASENP (DT the) (NN accident)) (VP (VBD involved) (NP (BASENP (DT a) (NN piece)) (PP (IN of) (NP (BASENP (JJ air-purification) (NN equipment)) (PP (IN in) (NP (BASENP (DT the) (JJ forward) (NN section)) (PP (IN of) (BASENP (DT the) (NN submarine))))))))))))) (PERIOD .))