We laid out 6 different 100 meter transects and then two divers ran the length of the transect, in SCUBA gear, and counted all scallops within 1 meter of the line. Thus we did 200 square meter rectangles.
Consistent with all the Lanark reports, I can tell you we found virtually NONE.
The visability was less than two feet, but we were doing close work. The water temperature was comfortable in just a dive skin.
The ONLY scallops found, though, were found by sense of touch only, and that was because they were buried and they looked like it too, very stained and dark. So we looked at 1200 meters and found 10 scallops and they couldn't be seen but only felt on the bottom.
Eureka! We proved it.
No scallops in Lanark! 
