brian: the background on john chatterton -- where did you get to meet him?t: chatterton i met when i heard about the story of shadow divers, the discovery of this lost uboat with 56 dead sailors on board. i was told about the story and it seemed to unbelievable to be true. so i called him out of the blue and asked if he could answer my questions. it seemed he answered every question but the one i never heard answered was the one i cared about -- why would you risk so much? three people died from this over six years. chatterton locked his marriage almost all his money. he came close to dying himself. it was for a three digit number. a footnote to history. no one explained why someone would risk so much for so little. brian: they have done a lot of television since this happened. robert: chatterton and his partner richie kohler went on to become the host of a series called deep-sea detectives, 57 episodes on the history channel airing nationally. they became quite well known. you can make the argument that chatterton is the most famous scuba diver in the world