Could the doomsday fortress that a US tycoon spent $1 billion on five years ago come in handy today?

The Mayan civilization's prediction that 2012 would be the end of the world has been discredited, but US tycoon Robert K. Vivos, founder of the Vivos project, is still convinced the world will end in 2012. Vicinel remained convinced of the end of the world, so in 2015 he built a luxury underground shelter in the German village of Rothenstein, an event that sparked a flurry of controversy as soon as it was reported by the Daily Mail at the time.

Robert? Vicinel's ? Fortress of Doom? , originally a military bunker left over from World War II, has been remodeled to withstand attacks from nuclear explosions, earthquakes, biological viruses and more.

Inside, there are swimming pools, gyms, theaters, churches, bars, gymnasiums, and everything in between, usually stocked with at least a year's worth of supplies, and outside, there are helicopters.

The underground fortress covers an area of about 20,000 square meters and cost about $1 billion, with the swimming pool in the fortress costing as much as $1.1 million, according to the underground fortress design, Robert? Vicinel can also rent out some of the rooms for other families to use, but the price is certainly not high.

Each housing area in the fortress has three separate explosion-proof passages, each with a 40-ton hydraulic blast door that, when closed, prevents the intrusion of floodwaters, toxic gases and so on, as well as a 5-kilometer tunnel for emergency escape.

Because the entire fortress is on top of a hard rock structure, it is highly resistant to earthquakes and maintains a year-round average temperature of around 17 degrees Celsius, as well as independent sewage treatment systems, air filtration systems and a power plant.

In the U.S., there are many more such doomsday forts, just not as large as Robert? In Georgia, for example, developers have converted an abandoned missile bunker into a doomsday shelter, complete with kitchen, living room, bathroom and bedroom, and sold it to the wealthy.