and if you had all kinds of crevices and big boulders all around. so rolling hills is not a bad place for sonar. we want to see the figure from the ground and if it is just rolling hills and if the actually sediment is around, things like man made objects and other metallic objects in principle should give us reflective options that would allow us to see the difference between the manmade objects and the rolling hills. >> do you think we may see manmade vehicles go down, i would imagine if that would be if the bluefin-21 doesn't locate anything? >> personally, i think the worst thing to do would be to send a manned vehicle down. i think the worst thing we have learned if you look at the gulf of mexico oil spill they were actually able to fix that with a