Police searching for missing Haverfordwest man Ben Thompson have focused towards the mouth of the River Ely in Cardiff today, using specialist sonar equipment.
Search teams have examined the stretch of river between Leckwith Hill bridge and the mouth of the River Ely, near Cardiff Bay Yacht Club.
The 34-year-old has now been missing for 12 days, since he socialised with friends after watching Wales play in the Six Nations at the Millennium Stadium.
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Low cloud will bring murky conditions with extensive hill fog.
The team, which is manned by volunteers, will operate out of Pontardawe Fire Station in partnership with Mid and West Wales Fire Service.
Dan Biggar has no doubt that Wales remain flrmly in the Six Nations title mix ahead of next Saturday's clash against Scotland.