Sci-Fi home security systems for the rich: The rise of the billionaire bunker Wealthy families across the country are shelling out millions to protect their loved ones from intruders, natural disasters or the apocalypse as home security goes increasingly sci-fi. Companies that provide concerned homeowners with futuristic gadgets - and a priceless peace of mind - have revealed the growing demand of costly bunkers, passageways, panic rooms and recognition software. Chris Pollack - president of Pollack+Partners, a design and construction adviser in Purchase, New York - told Forbes that, while security has always been important for the wealthiest clients, the spending on home security has noticeably grown in the past five years. And the options available on the market are like something from a Bond film. Hidden: Wealthy families are shelling out millions for advanced home security, including these secret bunkers that are hidden beneath staircases, behind furniture or in walls Former Israeli major general Aharon Ze'evi-Farkash has spent three years creating software that merges facial, voice and behavioral recognition technology, allowing the system can recognize the approaching person - so the owner has no need for a house key. 'It transforms you into the key for your building in under two seconds,' he told Forbes. Another option comes from Creative Home Engineering, which is based in Gilbert, Arizona. The firm provides secret passageways by hiding the entrance in custom-made bookcases, wardrobes or walls. American Saferoom Door Company has been making safe rooms for homeowners, companies and international organizations like the United Nations for 30 years. They sell between 50 and 65 custom-made doors a year, starting at $20,000 each. Protection: Creative Home Engineering, based in Arizona, provides secret passageways by hiding their entrances in custom-made bookcases Concealed: Companies say they have seen more demand in the products over the past five years The bullet-resistant doors, which are often hidden behind normal-looking doors, use automatic electromagnetic locks so there is no need to turn a knob. Another company, FLIR Systems, based in Wilsonville, Oregon, makes infrared cameras that can read the thermal heat signatures from anything nearby - even someone in a hiding place as far as 15km away. Among the business owners who practice what they preach, Al V. Corbi has reinforced his luxury residence in the Hollywood Hills, California with advanced safety systems. He provides other homeowners with similar gadgets through his firm, Strategic Armored and Fortified Environments. His family doesn't need keys to access the house thanks to biometric recognition software and they are protected against earthquakes due to steel-reinforced concrete structures burrowed 30 feet into the hilltop. Gadget: The Burglar Blaster Decintegrator showers pepper spray on intruders when tripped Smart: FLIR infrared cameras can read thermal heat signatures off people hiding as far away as 15 kilometers The family home features an underground bunker to protect against nuclear or chemical attacks. It is stocked with enough food, water and medical supplies for a family to survive from three to six months. Corbi's company creates extensive bunkers stretching for thousands of square feet beneath a building for its customers. They are usually accessible through fireplaces or lifting floors. The bunkers rely on geothermal power and have food supplies, wells for water and medical facilities. Others have entertainment areas such as theaters, restaurants and spas, meaning that if there was a disaster or invasion, families could survive inside for three generations. 'They would be the new Adam and Eve, essentially, who would start up everything again,' Corbi said. The Corbis also have a panic room with a CCTV system connected to the police. They can talk with any would-be intruders via a telephone system that broadcasts throughout the house. Secretive: The companies and homeowners believe the gadgets will help in the face of a natural disaster If all else fails, they can also deploy a range of blinding fogs. The fogs go in strength from 'benign to you shouldn't have come here,' according to Mr Corbi. 'If you saw this stuff in a movie you would think it is all made up,' Corbi, who uses his family home as the demonstration house for his firm, told Forbes. As well as Corbi's smoke system, there is the Burglar Blaster Decintegrator, a small ceiling-mounted device that showers pepper spray on intruders when tripped. These systems can even contain 'DNA code', Forbes explains. For example, SelectaDNA, used a series of synthetic DNA chains that attach themselves to an intruder. The invisible forensic code lingers on skin for weeks and shows up under UV light, and due to unique codes, can be linked to a specific home.