Somewhere out there are an admitted killer who crawled through a Texas prison's ventilation ducts, a murderer who apparently escaped from an Indiana institution in a garbage truck, and a Florida convict who got other inmates to put him in a crate at the prison furniture shop and had himself delivered to freedom by truck. They're among more than 220 state prison escapees nationwide who are listed as on the loose, The Associated Press found in a coast-to-coast survey. Most broke out decades ago, meaning the chances of finding them have dwindled dramatically — that is, if they're even alive. Still, "you don't forget about them," said former Oklahoma corrections chief James Saffle, who worked for 11 years tracking escaped convicts. "Sometimes, some little action they take will trigger something." For the past two weeks, up to 800 federal, state and local law enforcement officers have been searching the woods and swamps around a maximum-security state prison in far northern New York for two convicted killers who used power tools to break out. The hunt is still in the early and intensive on-the-ground phase. After sightings wane and the dragnets come up empty, some states regularly revisit escape cases, keep an eye on vanished prisoners' associates and check fingerprint databases, death certificates or other sources for new leads. But investigators largely have to hold out hope that they will get a tip out of the blue or that the convict will slip up, perhaps by contacting a relative or getting arrested for another crime. Successful escapes from secure, fenced prisons are rare. At least 24 states say they have no such prisoners at large. The U.S. Bureau of Justice Statistics reported about 2,000 state and federal inmates escaped or went off without leave in 2013. But the figure doesn't indicate how many were caught and does not distinguish between breaking out of prison and walking away from work release or other unfenced settings. The AP asked all states for a current total of escapees from secure, locked state prisons where they were held full time. California, the most populous state, and Ohio couldn't immediately provide an answer, and others responded only for recent decades, so the total is almost certainly higher than the 224 the AP counted. Officials say most of the breakouts are decades old because prisons have become more secure. Some escapees are surely dead. One 1955 absconder from Illinois would now be 112. One escape on Alabama's list happened in 1929. Maryland's 90 unsolved escapes date to 1937, many involving the notorious and now-closed Maryland House of Correction, which had a long history of riots and mass breakouts. Some fugitives' whereabouts are no mystery. Joanne Chesimard was granted asylum in Cuba after her 1979 escape from the New Jersey prison where the former Black Panther was serving a life sentence in the killing of a state trooper. Jose Fernando Bustos-Diaz, the Texas inmate who squeezed through the ventilation system in 2010 to get out of a 35-year sentence for cutting his boss' throat, is believed to be in Mexico. But others could be anywhere, as New York officials acknowledged after Richard Matt and David Sweat cut their way out of Clinton Correctional Facility in Dannemora, close to the Canadian border, on June 6.