Austrian Felix Baumgartner is set to break a world record from 23 miles high on Tuesday.
The parachutist plans on becoming the first human to break the sound barrier without propulsion or a vehicle.
"I practiced this for so many years and now we are almost there," he said. "So this is my biggest dream, and we are one step closer."
American Air Force colonel Joseph Kittinger, diving 19.5 miles (102,800 feet) in Aug. 16, 1960, holds the current record.
The record attempt was set for Monday by Roswell, New Mexico but was postponed due to wind conditions.
The dive is set for 9 a.m. ET, 5 a.m. PT.
According to NBC News, "plenty" can go wrong.
One of the concerns is air pressure. NBC News noted the air pressure is less than one percent of what's on Earth's surface. Being up high, above 63,000 feet, the lack of pressure can create bubbles to form in the blood as well as the body to swell.
Another concern is the temperature. When Baumgartner exits from his capsule, temperatures can be minus 10 degrees Fahrenheit but that number could get even colder as he dives further down. When the body temperature drops 82 degrees, unconsciousness is likely, even death if the body temperature drops below 70 degress.
The drop will be documented by National Geographic and will broadcast in November. Kittinger will also attend the event.
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