you. that s about 79 feet in the entire state of west virginia. west virginia is about the same size as a search zone. so you get a sense of the challenge here. looking for something that is about the length of a tennis court by air in rolling waves in area the size of west virginia. t.j., back to you. tom, who s been on this, thank you so much. we ll check back in. turning to former admiral allen. sir, thank you for being here. we hear how large the search area, even narrowed down. give us an idea here, sir, just how i guess, improbable is it even if you know the search area now and it is a little smaller, still how impossible is it that they find anything? well, t.j., under international search and rescue doctrine, there are key terms to be familiar with. one is datum.