This is one of the many stories that really should be better known -- I realize that the TV stations have a hard time finding space for real news in their shows between car crashes, fires, and celebrities.
Northwest Straits Commission spent a lot of time developing a protocol to safely remove derelict gear using professional divers. They have been circulating various forms of a video about it for some years.
Here is a shameless plug: the complete video about the derelict gear removal project is included in Episode 10 of my TV series, "SEA-Inside: Pacific Northwest" -- the only TV series to focus on what's going on beneath the surface of Pacific Northwest waters. You can order it from the SEA-Inside.org web site, or look there to see if the series is on cable in your area. Lots more stories in other episodes.