for more on this but spring and a former fbi agent you been involved in searches like this. perhaps not of such difficult terrain. walk us through the search what are investigators duhamel and what is the purpose of using cadaver dogs as we understand their potential looking for a body or do they still believe h could be alive? thank you so much for having me. we are looking at a broad spectrum of things that may hav happened. perhaps he took his own life or something has happened to him. they are doing things such as using thermal imaging from above. they are concentrating on a search with cadaver dogs and dive teams.