Many large ships have vanished,too.One weighed 20,000 tons. Another had more than 300 people on board.The radio on one large ship from Japan sent a very strange last message.It said, “Danger like dagger now.Come quickly！We cannot escape.”After this message,the ship vanished from the sea.Many large ships have vanished, too. One weighed 20,000 tons. Another had more than 300 people on board. The radio on one large ship from Japan sent a very strange last message. It said, “Danger like dagger now. Come quickly! We cannot escape.” After this message, the ship vanished from the sea