"We might die if you don't come help us," he said on the phone.
The group were trapped inside the lift. Photo / Tony Luu
Luu's roommate and two other people managed to open the elevator from the lobby by the time the water was up to his neck.
"Once I got down to try and open the door then it was up to my neck, yeah, it got pretty high," Luu said. "We just got it open and started swimming out and once I got out I just couldn't believe like wow this is something you see in a movie," Luu said.
Suzanne Fortin, the meteorologist in charge at the National Weather Service's Omaha forecasting office, said it has been roughly two decades since such severe flash flooding hit the area.
She said as much as 12cm of rain fell in a short time period, and Omaha's lower elevation caused much of the floodwater to flow downtown.
Fortin said there have been no reports of injuries.