One incident that is getting a lot of attention at the moment happened in Chile, two years ago.
The information was released to the public by the Chilean Navy, some days ago.
See, e.g., Leslie Kean's article on it:
http://www.huffingtonpost.com/entry/...b014e7c72ee56b
Here is one of the videos about the incident.
And here is the full footage, as released by the Chilean Navy: