Mr Dykes is holding the youngster at his remote home inside an underground bunker, police said.
Meanwhile, British military divers are searching a flooded underground bunker near Basra for chemical weapons.
Charlie Company, from the 1st Calvary Division, had stumbled upon a massive underground bunker of North Vietnamese troops.
Authorities have been conferring in a nearby church and communicating with Dykes through a ventilation pipe to the underground bunker.
The 25.5 acre (10.3 hectare) Neatishead base, near Wroxham, includes a high-security fence, a Cold War underground bunker and a helipad.
And during the Cold War, the U.S. government set up an underground bunker from which to operate in the event of a nuclear attack.
In February, members of the team rescued a 5-year-old boy from a small underground bunker where he was being held hostage by a 65-year-old man.
The underground bunker would be a very good data storage centre and its proximity to the Norfolk Broads and the coast open up leisure possibilities.
The Alabama man who held a five-year-old hostage in an underground bunker for nearly a week was killed during a firefight with police, the FBI says.
Both were members of the bureau's elite hostage rescue team, a group known most recently for rescuing an Alabama boy from a kidnapper in an underground bunker.
Late in the evening, the man had the child in some sort of underground bunker or storm shelter, and SWAT team members were communicating with him through a PVC pipe, CNN affiliate WSFA reported.
Once a simple outsourcing shop that ran bank computers for a fee, ACS has pushed into a dizzying variety of new services, which include scanning credit card applications into computers and storing microfilmed copies of documents in an underground bunker in Mississippi.
In 1993, an early-morning explosion in Managua below the workshop of a Basque mechanic revealed an underground bunker stuffed with weapons, forged passports, and documents, including plans for past kidnappings to raise money, notably that of a Brazilian industrialist, Abilio Diniz, in 1989.
Katie Beers, who was kidnapped as a 9-year-old in 1992 and kept in an underground bunker in suburban New York for 17 days before her captor surrendered to police and showed them where she was hidden, said she was "ecstatic" that Ethan was rescued safely.
As well as bricking up the shattered walls, some of the agencies have added a new feature not envisaged by Kuito's original planners: an underground concrete bunker, reinforced against future possible attacks.
"I'm against underground homes, bunker-style homes, fortress-style steel shutters--it just attracts notoriety, " says Joel Skousen, author of The Secure Home and a number of other survival books.
Neighbor Michael Creel said Dykes put the plastic pipe underground from the bunker to the end of his driveway so he could hear if anyone drove up to his gate.
Someone who knows all too well what Ethan may go through is Katie Beers, who as a 10-year-old was held underground in a concrete bunker for two weeks by a New York man.
The suspect, who police have identified as Dykes, is holed up in a bunker 4 feet underground and built at least partially out of PVC pipe, authorities have said.
Dykes told authorities that he had blankets and a heater in the bunker, and authorities have previously said the bunker -- built 4 feet underground -- has electricity.
Dykes has told authorities he has blankets and a heater in the bunker, and authorities have previously said the bunker -- built 4 feet underground -- has electricity.
Dykes has told authorities he has blankets and a heater in the bunker, and authorities have previously said the bunker -- built 4-feet underground -- has electricity.
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