Sinkholes can occur abruptly or be years in the making endangering people anywhere from Florida to Croatia. RELATED:
Recordings of 911 calls released from the scene of the Florida condominium building collapse reveal the chaos and anguish ignited by the tragedy that killed at least 97 people.
One man, who said he was fleeing the building with a group of family members and others, said he heard people screaming for help from the rubble.
"There are people yelling, saying they are stuck in the part of the building that collapsed," he said on the call. "They they keep yelling. … There are people in the rubble yelling."
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