Rescue workers told CNN mid-morning Friday that the Plan A drill has cut 41 meters into the rock between early Tuesday morning and late Thursday night.
The fire and rescue service earlier reported three mid-terrace properties "well alight", as it made efforts to stop the flames spreading to adjoining properties.
Mid and West Wales Fire and Rescue Service said they had been inundated with requests for help.
Mid and West Wales Fire and Rescue Service dealt with more than 300 calls on Friday evening.
Overnight, two crews from Mid and West Wales Fire and Rescue Service have been called to a gorse fire at Sarn Helen, near Lampeter.
Mid and West Wales Fire and Rescue Service were called to Kenfig Industrial Estate, near Margam, at 0615 BST after reports a van was stuck in floodwater.
Mid and West Wales Fire and Rescue Service said it was called out to around 45 flooding incidents on Saturday morning, including at some two dozen homes on Gower, Swansea, and in Llanelli, Carmarthenshire.
BBC: Flooding: Heavy rain could spark more floods, agency warns
Mid and West Wales Fire and Rescue Service said the holidaymakers were told to leave the property because of the amount of smoke caused by the blaze, which had been first reported at 20:17 GMT.
BBC: Rhossili Bay holiday cottage evacuated after grass fire
In Pembrokeshire, Mid and West Wales Fire and Rescue Service was called to flooding on the road by the army camp in Penally, while the A4139 in Lydstep has been closed between the B4584 at Manorbier and School Lane in Penally.
Rescue work was continuing at the site of the mid-morning explosion in Shandong province's Caofan township, the Xinhua News Agency said.
South Wales Fire and Rescue Service said they were called for help by colleagues from the Mid and West Service shortly after the area was hit by a large hailstorm.
Many Germans were horrified to discover that the EU rescue package for Greece last year helped to bail out public-sector workers who could retire in their mid-50s on almost full pay.
ECONOMIST: The biggest barrier to public- sector reform are the unions
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