Investigators are still trying to determine the exact location of voids as big as three terraced houses which have opened up beneath a main Gower road.
Part of south Gower Road was closed on Wednesday, September 30, after it was found to be at risk of 'imminent collapse' because of a hole beneath its surface.
According to Swansea council the hole sits just a few feet below the surface.
The road between Nicholaston Farm in Penmaen and the turn-off to Oxwich was closed so contractors and geotechnical experts could survey the are and establish the extent of the repairs needed.
Diversions are now in place to maintain routes to and from south Gower locations such as Port Eynon and Oxwich.
It is still unknown when the road will re-open and one local business has said it will hit them financially if it stays closed long-term, the last thing they needed after a year of disruption caused by the coronavirus pandemic.
A Swansea Council spokesman said investigations and work to fix the hole were still in their early stages.
He explained: "Initial work involved the drilling of bore holes so camera equipment could be inserted under the road.
"The latest work on site has involved the excavation of the road surface across the entire width of the road and investigations are continuing to determine the exact location of voids which have likely been created by water."
Mark Thomas, cabinet member for environment enhancement and infrastructure management, said their priority was making the area safe for motorists to return.
“We are still in the early stages of our investigations to establish how serious the problem is," he said.
“Our main concern is for the safety of motorists and others that use this route, so the immediate closure has been absolutely vital, not only to protect the public, but to enable contractors to move on site quickly and carry out the work needed.
“We have a geotechnical expert on site also who is providing expertise in terms of what is beneath the road and how we need to proceed with our investigations.”
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Ground experts have found holes "quite shallow" beneath the road and have opened up the highway to investigate them further.
They will then have a better idea of when the road might be able to re-open.
John Stark, from Quantum Geotechnic, said: “Depending on what we find during the investigations we will then look at designing remedial measures so the road can be re-opened.
“Sinkholes and subsidence are quite common in this area particularly because of the limestone in the ground – this erodes over time when water is running through it and that’s why voids are created.
“This section of road is also in a natural hollow in terms of the immediate surrounding area so it’s not a surprise that these issues are here and have been identified.”
