lost family members and loved ones tonight that there will be a hole in their hearts as the families try to deal with this tragedy and five families are still waiting. >> and this navy yard that -- parts are open to the public. when you hear that and you hear this is among the most secure places, that seems to be a contradiction. >> you have to control access right at the gate as to who you allow on board. although they allow people on, if a civilian drives up and wants to see the navy museum, that vehicle is inspected. everyone inside is identified and they know who is there. typically you need an escort to get on the base. while they can go into unsecure areas on the yard itself, to get in the buildings that is a different level of security. and that's why the investigation