Deaf and dumb divers

Last night, Brian and I were watching 'Nature' on the PBS HD channel on our fabulous plasma TV. It was really amazing. They cut from an underwater shot to one of the divers getting out of the boat. They were talking to each other, but all we could hear was the sounds of the water lapping up against the boat. No words coming out. I said to Brian, "I think something must be wrong with the audio." And he said, "No, I think they're just deaf and dumb." Huh? Why were they talking then, moving their mouths? "They must be lip reading" was his answer. I asked him to check the 'info' for the program on the cable - surely if this was a program focusing on deaf and dumb scuba divers, it would mention that in the program notes. But it did not. More of the show, more water noises, no words. I noticed that it wasn't narrated either, which seemed strange. I made Brian check the non-HD channel and it was fully narrated AND the people were talking out loud. So no shows about deaf and dumb scuba divers. There's a niche that needs to be filled, if you're looking for one.