After the discovery of the mounds, three well-documented surveys of the area were undertaken, one in June 1998 (Bett 1999), August 1999 (Bett & Jacobs 2000,) and twice during summer 2000 (B. Bett, pers. comm.). Instruments deployed during the studies included side-scan sonar, stills and video cameras and piston corers. However, the entirety of what was lost to heavy-netted fishing trawlers remains unknown.