On the same day, the 18th of August, there was the sonar examination carried out by Mr. Cardew. He told us he did his work from a sailing boat. He sailed up and down the lake between two buoys some 230 metres apart. He produced for us the sonar impressions with annotations which we have in tab 13. Perhaps we could just have a look at those, please. Tab 13 is the first series. As a preliminary he told us that the equipment that he had would pick up an object the size of a Transit van at 200 metres, pick up a small car at 100 to 150 metres and could pick up quite small objects once one got close to them, but he would be surprised he said with his equipment to identify anything as small as a shoe or an item of clothing.
Now if we look at the images produced, on page I think three, he showed us the various points that he had identified. He said the white dot was the date and point that he had been given. T1 was the sight of a significant depression in the lake bed, and he thought the buoy on the surface would be likely to have been within five or ten metres of the spot where the weight had been put down, allowing for the slight North and South current and for some slack between the weight and the buoy. The depression he said in the photograph was about 25 metres away from the data given to him by the police officer. He said there was the indentation that appeared to have been left by something like a heavy package. On pages three and four, we have a closer, on page four we have a closer view of the indentation, and he said that the dark area above that was a rocky outcrop. Going back to page three, he said that T2, 3 and 4 were rocky outcrops, and T5 was another depression, measuring in that case about 1.5 metres by .5 of a metre, a little to the North of the date and point.