Earlier White House letter addresses US must prepare for comet collision Here. Now the U.S. Air Force has offered a rare glimpse inside its 'doomsday' plane, built to protect the President and his inner circle from the ultimate worst-case scenarios such as nuclear war and Asteroids/Comet collision.The E-4B Advanced Airborne Command Post is designed to be used by the National Command Authority as a survivable command post for control of U.S. forces in all levels of conflict including nuclear war. In addition to its primary mission, secondary missions assigned to the E-4B include VIP travel support and Federal Emergency Management Agency support, which provides communications to relief efforts following natural disasters such as hurricanes, earthquakes, asteroids strike.Fitted with radiation and electromagnetic pulse shields and able to launch within minutes, the $223million [tax payer money] plane is on standby 24 hours a day, 365 days a year.Unlike Air Force One, which acts as the President's regular means of long-distance transport, the plane is specifically designed to run the government and the military from the air in the event of nuclear war.Despite its size, the modified 747 can fly for days without refueling and all E-4B aircraft, as they are technically known, can reach speeds up to 620 miles per hour, 40 miles per hour faster than their commercial counterparts.People travelling on board can communicate with anyone on the ground and even nuclear submarines can be reached underwater when a five-mile long cable is extended out of the back of the plane for reception.'[We] drop is down and [it] transmits coded message traffic to U.S. submarines,' Captain W. Scott Ryder told ABC News.'Give us the phone number of anybody, anytime, anyplace, anywhere on earth, we can get a hold of them,' Master Sergeant Joe Stuart of the U.S. Air Force added.Aside from all the technology fitted in the plane, it also travels with an elite security team.'The first people off of the airplane are these guys, they'll position themselves appropriately around the airplane,' Ryder said.'The secretary also has his own small security staff that does similar things. So these guys are predominately designed to protect our airplane, and the secretary's staff protects him, as an individual.'The men sleep nearby so the plane can launch within five minutes of an attack. 'If the command centres that are on the ground in the United States have a failure of some sort, or attack, we immediately get airborne. We're on alert 24/7, 365,' Ryder said. 'Constantly there's at least one alert airplane waiting to get airborne.' Source: Dailymail