rtokens: Passengers who had paid $ 1,500 and up to accompany the recovery expedition on two cruise ships had returned back to port on Thursday , Purcell said .
pos: DT NN VBD VBN IN CD .
tokens: The wreck was located in 1985 .
ltokens: The steel-hulled Titanic , thought to be unsinkable , struck an iceberg on April 14 , 1912 , and sank , killing 1,523 of the 2,200 passengers and crew on board .