I know we were leaning towards the cave underneath Mars to be one of a jungle of sorts, but I also imaged maybe a lost city and other such ruins scattered around. I found these images whilst looking for some inspiration on what the cave beneath the surface could be like. Plus they were very inspirational. I've done a few rough thumbnails which I will show everyone on Monday (as I need to sort my scanner out). Do we want the cave to be just a jungle or does the ruined city etc sound like a good idea?