This is why we dive (VIDEO): Missle Tower Wreck San Diego, CA
If this video doesn’t show up, you can watch it here:
http://www.youtube.com/watch?v=rkbHYFvo44U
This wreck/artificial reef was used as a missile tower test platform for submarine based warfare. They would load a missle into it, sink it underwater and launch the missile. Of course, when the Navy was finished with it, the ceremoniously dumped it into the ocean as an artificial reef, very close to the Mexican Border.
Here is a still photograph that I shot last year.

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Wow! Awsome Video