A 4-arch iron design was used instead, with large chalk embankments on the approaches over the unstable ground.

This is more unstable ground and allows the legs to strengthen different muscles.

This area had unstable ground, and was not ideal for building tunnels.

However unstable ground meant that the line tunnelled through the hill instead.

But for the companies, shifting to a digital world means treading on unstable financial ground.

The unstable ground, with a high peat content, caused the building to settle and crack within a year of construction.

The one building was sinking as a result of the unstable ground.

This tower's sitting on some very unstable ground, I guess.

The building was kept unusually low because of the difficulties posed by the unstable ground.

The radar survey confirmed that both pools were on unstable ground and the repairs had failed.