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They are all boston strong and we salute them. Im anderson cooper. Good night. I hope you were with us during the last hour and you were inspired as watching adrianne hasletdavis story. She is truly boston strong. One thing she wanted to get across to everyone watching is something her grandmother said to her as a kid it is okay to not be okay sometimes. But adrien is doing okay. And she has a long road ahead of her as do many of the survivors but we will root for her along the way. If you are j...

Have exhausted the possibilities of finding more sound on the surface of the water. how will that work? what is that process? can you tell us? >> well, they are going to have to -- well, you have to retrieve the ppl on the end of the cable and then launch and recover using a crane. a torpedo-shaped object and means setting up a navigational grid on the bottom but a you cant use gps. the rhythm of the ship will change to the op-sec to allow them to launch and recover the vehicle. so a totally dif...