The two Mandalay Bay employees first on the 32nd floor in the Las Vegas massacre have spoken out on TV for the first time — describing to Ellen DeGeneres how they narrowly dodged death as killer Stephen Paddock shot at them through a hotel door.

Security guard Jesus Campos said he was originally called to the 32nd floor to check on an open door, and then found that a stairwell door had been blocked with a metal bar.

“At that time I heard what I assumed was drilling sounds. And I believed that they were in the area working somehow,” Campos told daytime talk host DeGeneres on the episode to air Wednesday.

In one of investigators’ timelines in the massacre that left 58 dead on Oct. 1, officials said Paddock shot at Campos through the door before firing from a broken-out window on a crowd at a nearby concert.

In the interview, Campos said he believes those drilling sounds might have been Paddock’s opening gunfire — and that the gunman fired at him through the door after Campos accidentally let a hallway door slam.

“As I was walking down [the hallway toward Paddock’s room], I heard rapid fire and at first I took cover,” he said. “I felt a burning sensation. I went to go lift my pant leg up and I saw the blood.”

When Campos was shot, maintenance worker Stephen Shuck told Ellen he was arriving in that hallway to check on the barred door.

“That’s when Jesus, he leaned out and said, ‘Take cover, take cover,’ ” said Shuck, who credited Campos with saving his life.

At about the same time, a female guest came out of her room and Campos shouted at her to get back inside, he told Ellen.