The marine certification company tells cnn they declined a request to certify the titan. they did not say why. >> all right. thank you very much. i want to go to greg stone now the chief ocean scientist for the metals company. he knew stockton rush and a fbi special agent. so i appreciate both of you very much. greg, obviously we're all sorry for this tragic loss and i'm sorry for the loss of someone that you knew. right. that you knew personally. obviously carbon fiber is -- the sub was up and down multiple times to the titanic. i don't know exactly how many but it had been back and forth a...