(S (S (PP (PP (IN On) (BASENP (NN board))) (BASENP (DT a) (NN tug) (NN boat))) (COMMA ,) (S (S (BASENP (NNS relatives)) (VP (VBD became) (ADJP (RB severely) (JJ emotional)))) (SBAR (IN after) (S (BASENP (DT a) (JJ Roman) (NNP Catholic) (NN mass)) (VP (VBD was) (VP (VBN celebrated) (S (VP (TO to) (VP (VB commemorate) (NP (BASENP (DT the) (NN memory)) (PP (IN of) (NP (BASENP (DT those)) (VP (VBN lost) (PP (IN at) (BASENP (NN sea)))))))))))))))) (PERIOD .))