Going on 12 years now. If I had known it would have taken so long before I started I might not have taken this on. It’s been a lot of work on my own time but it’s something I enjoy. Why did I start? I thought it would be cool to see it all mapped and see the patterns that result, including the temporal ones. And I think I was right - it is cool. Also, aside from this forum there’s been a huge interest in from folks involved with cleaning up potentially polluting wrecks and underwater cultural sites. Glad people are enjoying it and finding it worthwhile.