Los Angeles County sheriff's Deputy Adam Collette knelt on the asphalt and heard the muffled cries of a baby who had been buried alive.
He pried up two large pieces of asphalt, dug out loose dirt and plucked the newborn girl from the hole along a bike path, cradling her in his arms.
"I think the baby had a sigh of relief, and so did I," Collette said on Monday at a news conference.
"We kind of felt each other like, 'Hey, everything's going to be OK."
The girl, estimated to be 24 to 36 hours old when she was found on Friday, was healthy and in stable condition at a hospital.
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Authorities have urged the unknown mother to come forward in case she needs medical attention and also put out a call for people who might want to provide a foster home for the baby.
Two sisters walking on the bike path near a riverbed in suburban Compton heard the child's cries on Friday afternoon, Sheriff Jim McDonnell said.
"My sister said, 'Can you hear a baby crying?' And I said `no, I don't know'," Angelica Blount told KCBS-TV.
"'That might be a cat.' And she said, 'No, that is a baby."'
Blount and her sister Evangelina McCrary called emergency services.
Collette and Deputy David Perry arrived and tried to track down the muffled cries, finally tracing it to a 60-centimetre-wide semicircular hole, McDonnell said.
The hole, in the pavement at the base of a fence, was filled with loose dirt, vegetation and pieces of asphalt. Collette and his partner knelt and began removing the asphalt chunks.
Collette said even as he dug, he couldn't believe that there might be a baby underneath until he actually saw her.
"She was wrapped in what appears to be a hospital blanket, and her face was covered with the loose dirt," the sheriff said.
Collette, a father of two young girls, said she was cold to the touch but he couldn't see any signs of injury.
"The sun was going down, and I think the baby had maybe 45 minutes to an hour left for someone to find it," Collette said.
Doctors believe the child might not have survived overnight, the sheriff said.
