 We're chatting with Dr. Michael Cassetta, who is the Assistant Chief of Newtown Underwater Search and Rescue at 203-333-9422. If you've got a question or comment, you can pick up the phone. Dr. Mike, tell me about the search aspect of this. In other words, you get a call, someone is drowning, maybe they're already under. What are some of the techniques that you would use to try and pinpoint where that person is?