Spot the Mars Polar Lander disappeared on Mars in 1999

The game is: find something looking like this on 18 pictures of Mars surface. Each picture is as big as 1600 monitor screens at 1000×1000 dpi of resolution. Click HERE and help science to understand why the Polar Lander wen so badly silent 9 years ago (choose Full image (grayscale, non-map projected) for each picture to have a nice look on Mars surface). To get an idea of what you should see, here are pictures of the path finder.