TMHeimer,
Here is the info from the FWC regarding sea shells:
http://myfwc.com/fishing/saltwater/recreational/sea-shells/
There are a few artificial reefs that have been placed around Santa Rosa Island. The one currently being discussed will require a surface swim of about 90-100 meters. It's located between Navarre and Pensacola Beach, near the Portifino Resort.
I'll find a map and some pictures of the site when I've got access to my laptop.
There's another artificial reef that was placed off Navarre beach just a few weeks ago it should be very similar to the older one located to the west, however I think this new site has more structure.
There are at least three more placed on the north side of Santa Rosa island, in the the sound / bay. It's likely that those three sites may have vis in the 3-5 cm. range, though.
Edit:
Here's the info on what a lot of us call the 'Portifino X-mas Trees'
**2nd Edit:It appears that link no longer works.. . I've uploaded the .pdf to the Gulf Coast Dive Society Facebook Page. Let me know if there's any trouble viewing it.**
https://www.facebook.com/groups/gcds1/251484431640650/
The 'trees' didn't quite land in a straight line
The installed the structures in two phases. Here's a satellite view earlier on:
And now, after all the structure has been placed:
I'm still looking for the drawings of the Navarra reef that was just installed. There out there, somewhere
In the mean time, here's some info about the site:
http://www.navarrebeachmarinesanctuary.com/?p=1668