Think about a Cold War-era supersonic fighter designed to catch up with Soviet bomber planes retiring in a state where it sits untouched, at least 100 feet beneath the surface of the waters near the Florida Panhandle, serving no purpose other than housing amberjacks. This is not science fiction but simply how Florida manages fisheries. According to a January 2004 guidelines document jointly produced by the Gulf States and Atlantic States Marine Fisheries Commissions, retired aircraft have been sunk by the United States for many decades now as artificial reefs. Florida has embraced this concept more than any other state.In September 1995, three decommissioned F-106 Delta Dart aircraft, Air Force interceptors that had spent their final years as QF-106 target drones flown out of Tyndall Air Force Base's 82nd Aerial Targets Squadron, were deployed to the bottom of the Gulf of Mexico off Bay County, near Panama City. Bay County's own artificial-reef database lists the deployment as three F-106 airplanes placed at Large Area Site A on 9/25/1995, at a depth of 112 feet. The depth is so great that only qualified divers have been able to view them up close.Why sink a perfectly good fighter jetWhat follows is the point that might irk the environmentalist in you: Dumping military junk into the sea is precisely the type of cutting corners that one might associate with the nineties. But it's not cutting corners. It's a policy, and quite stringent at that. Before being dumped, whatever it is that gets dumped has to be stripped of its fuel, hydraulic fluid, and any material that might be toxic when left to leach.An F-106 Delta Dart aircraft. Image credits: WikipediaThe rationale behind such an idea is quite simple: the Gulf Sea Floor is like an underwater desert. Fish need some sort of cover to breed, find shelter, or even prey on others. Just dump some metal with a certain shape in there, and marine life will start coming up soon enough. Florida Sea Grant's Bay County agent has described new artificial reefs drawing fish "almost immediately," with a fully developed habitat typically taking three to five years to form.This is important since Florida's artificial-reef program does not consider the ocean as a dumpsite for anything. The state notes that artificial reefs can only be erected by officially recognized state or local government agencies in authorized sites under federal permit procedures. Artificial reef construction in Florida is allowed in the form of concrete, limestone, and heavy-gauge steel. As noted in the 2004 Gulf and Atlantic states guidelines, there are three basic characteristics of reef material that need to be considered. These include the need for the reef material to be biologically compatible, stable, and durable. This explains how a decommissioned airplane becomes reef material while any other military garbage cannot be regarded as such.The jets versus mother natureSubmerging a structure is the easy part. Keeping it intact through hurricane season is the real test. Steel-hulled reef vessels are not passive once in the water; storm surge can shift, tip, or tear them apart. The GSMFC/ASMFC guidelines document this in detail for steel ships: Hurricane Andrew (1992) moved some Florida wrecks by as much as 100 yards and broke several apart, and Hurricane Hugo (1989) dragged a 450-foot vessel roughly 700 feet across the seafloor off South Carolina. That data specifically covers steel-hulled vessels; the guidelines treat aircraft as a separate material category, since a Delta Dart's airframe is aluminum alloy rather than steel, and corrodes and fails differently in seawater.The Bay County jets got their first test almost immediately: Hurricane Opal, a Category 4 storm, made landfall near Pensacola on October 4, 1995, barely more than a week after the F-106s went down, followed by additional hurricane seasons in the years after. Whether the F-106s themselves survived Opal intact, and how many later storms they weathered, isn't something I could confirm from a public source, so that detail is left out here rather than guessed at. In the years after deployment, a Florida Sea Grant volunteer survey of an F-106 reef off Bay County documented red snapper and other reef fish using the site. Separately, the same guidelines document notes that greater amberjack are among the species known to aggregate on wreck-type artificial reefs elsewhere in Florida, which is part of why they're a draw for anglers at sites like this one.Is this actually good conservation, or just convenient disposal?The truthful answer would be that it is a little bit of both. It costs less to sink the retired military equipment than to recycle it in the state, and there are additional tourist and economic benefits from it: Florida's Fish and Wildlife Conservation Commission promotes their program specifically for such purposes. There's probably nothing selfless about such an arrangement, and it makes sense to be suspicious about the program that is equally beneficial for industry and ecology.It would appear that the longevity of the F-106 site influenced future decision-making. The Bay County government used an underwater assessment of the F-106 wreckage that discovered red snapper and other popular reef fish species several years after the deployment as an excuse for sinking two retired F-101 Voodoo interceptors off the M.B. Miller County Pier in June 2014. The project cost the county $30,000 provided by its Tourist Development Council. Members of Tyndall Air Force Base's Dive Club and aircraft maintenance instructors contributed over 600 hours of their voluntary time to prepare the Voodoos, with amberjacks and snappers spotted at the site shortly after deployment.A greater amberjack. Image credits: WikipediaHowever, the ecological benefits are genuine. Artificial reefs concentrate marine life in areas that were previously flat and empty. How well any given reef resists storms depends heavily on the material, its depth, and its orientation; the guidelines are explicit that stability is "variable," ranging from no movement at all to shifts of hundreds of meters, rather than artificial reefs simply outperforming natural ones. What is more important to note is that artificial reefs should be constructed only from those materials that will survive long enough and be ecologically safe; otherwise, it's impossible to recognize the sunken plane after decades, rather than piles of debris.