The document discusses the search efforts to locate the wreck of the HMAS Sydney II and compares the approaches taken by different individuals over time. It provides details on the search methods used by Kirsner and his colleagues from 1991 to 2004, which initially followed search and rescue models but later incorporated additional survivor reports and mathematical modeling. It also examines the search approaches used by David Mearns from 2004 to 2008 and notes that early oceanographic studies incorporated variability in ocean currents, whereas Mearns' initial understanding was that currents flowed uniformly north. Finally, it compares the size of search areas recommended by different experts to the precision achieved by underwater archaeologist Bob Ballard in other famous wreck discoveries.