[hguant]

1. Generally photos from active investigations aren't released until the investigation is completed. These are active records, and could potentially become part of civil or criminal hearings, so the agencies in charge of them tend to keep them close until they've finished the report.

2. The US Coast Guard is a part of the Department of Homeland Security; the sonar and pictures they take could reveal capabilities they deem important to US national security (ie how good the sonar is, resolution of photos, etc.).

3. It's generally considered poor taste to post disaster photos before the families have had funerals. Naval institutions tend to be more tradition focused than other entities.