over the side now. my guess is that it is a tow system. and then they probably have other things too that we are not aware of yet. is there anything else that would replicate the frequency that these chinese officials believe is characteristic of a pulse? >> not off the top of my head but in air france we had a false alarm or two. other groups have told me they have had false alarms. 37.5. so it is not unhard eard of. it may be whales or a ship making that noise. >> thank you so much. for the latest on what that ship is doing let's check in with matthew chance. what do we know about the