The 30 foot wide hole has left a storage shed dangling over the edge
Nearby residents of Towy View Park, off Capel Dewi Road, just outside Carmarthen, said they were woken by a sound like thunder before 7am today.
The sinkhole, approximately 30 foot wide and deep, took away part of the ground underneath an empty storage shed.
Towy View Park is built on the site of a former lead mine.
"It sounded like thunder," said a park resident this morning.
"I couldn't believe someone was doing DIY that early in the morning. But when I went out to walk my dog, I could see it. It's a real worry for us."
Jack, who lives nearest to the hole, said he didn't initially realise what had happened.
"I'm sitting with my back to it in the house, watching the news, and i heard what i thought was thunder," he said.
"I looked out and the sky looked pretty clear, and I didn't take any notice.
"At 7am I went to Carmarthen in the car, and didn't even see it on the way out. Came back, and I looked in the mirror and thought - that looks strange. That's when i saw it. It was about quarter to six this morning.
"It's very close, and I'm feeling very uneasy about it."
Another witness said: "I was walking the dog this morning, when I spotted this huge sinkhole.
© Steffan StorchLand underneath a storage shed
"There is normally a high bank bank there, so it caught my eye. Then I realised exactly what had happened.
"When I was there the guy in the house next to it came out - he was so shocked he fell back against the wall.
"He was stunned."
A spokeswoman for Carmarthenshire County Council said they "were not aware of the sink hole from a public protection aspect", but an officer was on the way to investigate.
Robin Staines, Head of Housing and Public Protection, added: "We are monitoring and supporting the landowner and residents," stressing that the land is privately owned.
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