will go. that will be problematic, so i don't know where they plan to do the survey but they're on the edge of their operation depth. >> and david gallo, we're looking add the planned ocean shield, the wallaby plateau. >> right, it stands about two miles above the surrounding sea floor, about two miles in width. and the volcanic structure is covered probably with sediment, so the northern flanks will have gulleys make it difficult. >> we're measuring the distance between the detections. and maybe david gallo can assist us in understanding. david, the distance between the first and second seems to be