and the radar works really well. it's designed for any submarine so picking up a submarine so will pick up small bits of stuff in the ocean. >> reporter: as captain mcbetween leads this -- >> hope today will be the day. >> reporter: -- his optimism is something that's been a constant campaign yore for crews still searching. >> and, of course, the families of those missing are caught in a personal nightmare and some of them say they're also caught in a web of politics and crisis management. sara sidner has the story of one group who believe they have become captives of the malay authorities as they await word of their loved ones. >> reporter: for weeks malaysian airline officials in kuala lumpur have been protective of the families of those aboard flight 370 shielding them from everything including the media. the families initially appreciated it. but some of the family members