Engineers working at the St Albans sinkhole have revealed the ground is still moving and cracks are appearing.
The 33ft (10m) deep crater appeared eight days ago in Fontmell Close, and nearly 7,000 tonnes of concrete has been pumped into it.
Hertfordshire County Council has said tests are under way to see if there are any more cavities.
It is unable to say if there has been further movement without looking at the results of that monitoring work.
Dozens of residents have been unable to move back into their homes.
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