"I know I had to keep calm, to keep her calm," the dispatcher said. "I had to keep it together."
There was a 30-second span where Antonio remained silent and first responders hadn't yet arrived when Allen said she feared for the worst. But moments later, Allen heard the voices of deputies at the scene, signaling that Antonio was going to be OK.
Antonio was pulled to safety by Hillsborough County Sheriff’s deputies Jeremy Pollack, Chris Sullivan and Ryan Cooper, who she also met again on Thursday.
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"When she stopped talking to me I felt my whole body just sink into my chair," Allen said. "It was a stressful situation and I'm glad it turned out the way it did."
Antonio was coming home from a New Year's Eve party when she lost control of her Toyota Scion, and it flipped near Exit 7 of Interstate 4.
As water began to fill the car, Antonio said she couldn't find her phone — but used her AppleWatch to ping and find it for the life-saving 911 call.
Sheriff's deputies did not administer a field sobriety test on Tuesday because Antonio showed no signs of impairment, department spokesman Daniel Alvarez said.
"If she were even a little drunk, she'd be dead," said Alvarez, crediting Antonio's fast thinking for using her watch to find her phone under water.
"Even sober, I wouldn't ever have thought of that."
Antonio told deputies she was cut off and swerved to avoid a crash, landing her in the muddy ditch upside-down, officials said. She spent about 20 minutes in the submerged car before rescuers got her out.
"Hi, I've been in a car accident. My car is flipped and I can't see anything, there's water getting in the car," Antonio told Allen in recordings of their call. "There's water getting in the car and I can't get out."
With her phone's battery dying at less than 5 percent power left, a panicked Antonio told Allen that time was of the essence.
"I'm freezing," Antonio said, explaining how the water was filling her car. "Now it's up to my chest. I'm flipped upside down."
The dispatcher told Antonio that help was coming.
"Yes ma'am, we have people on the way. Just stay on the phone with me, OK?" the dispatcher said.
Allen repeatedly asked Antonio to look around the car for anything she could use to possibly bust open a window to escape. And each time, Antonio said there was nothing like that she could find.
"I'm freezing. I'm so scared," Antonio reiterated.
"I know, I'm here with you, OK?" the reassuring Allen said. "Try to stay on the phone with me as long as you can."
While Antonio managed to keep her wits about her, she didn't hide the fear she was feeling.
"Are they close? Because the water is coming in fast," Antonio said. "It's getting there, it's getting to my neck. ... Please hurry I'm scared, I'm really scared."
David K. Li
David K. Li is a breaking news reporter for NBC News.