. >> talking to cameron there is john garvin, another project manager.s fully pulled out, airbags attached to keep it in position once in the water. the hatch has been lowered and cameron is going to be bolted into the deep sea challenger. garvin narrates the launch. the crane attaches to the lifting point in the middle of the sub. there's a number of tag lines under high tension in addition to the crane to stop the sub from moving and swinging. when you see the sub first hit the water, the divers will come in and their first job is to uncouple the crane. >> you have to make sure the sub doesn't rotate around quickly. it's about not getting injured. >> when the last airbag is removed, cameron and deep sea challenger begin the descent. >> deep sea challenger, do you copy? >> inside the control room, there's a problem. communication malfunction. >> do you copy? >> copy you loud and clear. >> cameron descends for an hour. then there's another malfunction. >> deep sea challenger advises that he has thruster failure. >> reporter: cameron continues on. then at