The next eight diagrams are the actual bitmaps drawn with none other than trusty old Paintbrush! They show 2D sections through the lake starting with the North-South section and moving clockwise in increments of 22.5 degrees.
(?=The red lines indicate areas that were not measured owing to technical difficulties. Measurements of these areas were not pursued owing to the fact that they were way beyond the recommended safe diving limits of your regular sport diver anyway.)
