Difficulty in Mapping Floor of Indian Ocean
WHITFIELD: Welcome back. Four weeks into the search for flight 370 and another report of floating debris in the Southern Indian Ocean, and China's state news agency is reporting a ship detected a possible pulse signal with the same frequency as a black box. But as CNN's Chad Myers explains, the Indian Ocean is such a remote area, that there's no easy map to follow.</s>CHAD MYERS, AMS METEOROLOGIST: You know, many people have asked, how could we not have the entire ocean mapped? Let me give you a little sublime idea of how difficult that would be. We have a ship. It's pinging. It's seeing the beam width down at the bottom of the ocean, about five miles wide. The ship is moving five miles per hour mapping a big, long stripe. Think about a lawn mower going in one direction. Turn around and go the other direction, back and forth and back and forth. The earth's ocean is 130 million square miles. You can only do 25 square miles an hour. I did the math. If you never go for fuel, you never get new crew members, it would take one ship 593 years to map the ocean. A little bit sublime when you think how much potential is here at 130 million miles. So much of the ocean floor to map. So what do we know about this area? Up in here, where the search area is, now, every line you see is about a five-mile width strip that some ship has either gone that way and mapped and that way and mapped and that way and mapped. But look at all the blue areas that have nothing. Not one ship has ever gone through those areas right through there. We'll compare that to the United States, and thanks to NOAA and a lot of shipping around our area, the entire east coast completely mapped, up and down, the west coast completely mapped. You get farther out, obviously, more sparse, but still, we have a much better idea of our area here than, of course, that Indian Ocean, which is so remote.</s>WHITFIELD: A very complex region. Thank you so much, Chad Myers. Appreciate that. When we come back, we'll have our expert panel with us. What happens tomorrow, in just a matter of hours, when the search resumes at daylight?</s>DR. SANJAY GUPTA, CNN CHIEF MEDICAL CORRESPONDENT (voice-over): For Schuyler Ebersol, high school started pretty normally, but his luck quickly took a turn for the worse.</s>SCHUYLER EBERSOL, LIME DISEASE PATIENT & AUTHOR: I would have sometimes difficulty breathing. I'd have severe dizziness so that I couldn't really walk or see straight for days at a time. I would faint randomly and I would go to sleep some nights and not sure if I'd wake up in the morning.</s>GUPTA: At first, he chocked it up to stress but then realized something was really wrong.</s>EBERSOL: No one knew what was wrong with me. And there were all sorts of hypotheses.</s>GUPTA: Home from school for months at a time, away from his friends and world and very sick, Ebersol desperately needed an escape, and he found it, in writing.</s>EBERSOL: I just started writing, and I would get lost in this world, and I identified with this character. It was a way to keep me going while everything else in my life wasn't so great.</s>GUPTA: Then, after several months, doctors finally discovered the cause of his symptoms, a rare form of Lyme disease. At the same time, his scattered pages started to jell into a book.</s>EBERSOL: The book is called "The Hidden World." It's about a main character who has a heart attack. He slips into a coma, and when he wakes up, he turns into a wolf in the hospital room.</s>GUPTA: Sound familiar?</s>EBERSOL: I didn't really intend for there to be a lot of me in the main character, Nate Williams, but it sort of happened that way.</s>GUPTA: "The Hidden World" was published last December, with more in the works. And Ebersol said, through it all, writing saved his life.</s>EBERSOL: You really just have to find something that can sustain you and keep you mentally strong. For me, it was writing and then the quest to get published.</s>GUPTA: Dr. Sanjay Gupta, CNN, reporting.