At the desert campbase, Haddock, while drunk, remembers that Sir Haddock's ship was ambushed by a pirate ship led by Red Rackham, who is later revealed to be Sakharine's ancestor. Sir Francis surrendered on the condition that his crew be allowed to live, but since the pirates killed his entire crew, he chose to sink the "Unicorn", along with most of its treasure, to prevent it from falling into Rackham's hands. The story implies there were three "Unicorn" models, each containing a scroll; together, the scrolls can reveal the location of the sunken "Unicorn" and its treasure.