about equal to 100 square miles, so give you some sense for what they've about completed surveying. so it's a large area. this isn't a very detailed map so we can't account for small changes and rocky surfaces, but our best guess is that it's covered with sediment which is good for trying to find a debris field or manmade object on the sea floor. >> the bluefin 21, vehicles scanning for any trace of malaysia airlines flight 370 is in the water now for the eighth time, up to 11 military planes, 12 ships are also in on the search today. >> but the weather, that's the problem. it's certainly not helping. nearby cyclone is making for some windy and rainy conditions. cnn's miguel marquez rode along with the crew that's played an integral role in the surface search and here is his report. >> reporter: another day, another search, another hope of finding something, any scrap of debris related to malaysian flight 370.