Gardaí investigating the disappearance of Tina Satchwell have brought in engineering experts and mini diggers as they carry out a major search at a house in Youghal.

Gardaí yesterday upgraded their investigation to a murder inquiry, over six years after the 45-year-old was reported missing from her home on Grattan Street in Youghal, County Cork.

A man in his 50s was arrested on suspicion of murder and is now being held at Cobh Garda Station.

Gardaí have now sealed off a house in Youghal, with a major technical examination now underway.

A member of the Garda Dog Unit at the scene in Youghal. Image: Jamie O’Hara/Newstalk

The search involves industrial digging equipment and experts in building and engineering have been brought in.

Investigators are examining the interior walls, ceilings and floors of the house and a search of the outside area is also underway with a focus on the pavement and drain.

The search will include a dig of the garden and the dismantling of an area of concrete at the back of the house.

The search could take days and is likely to involve the Garda Dog Unit.

The investigation has seen significant local interest in the area, with large crowds gathering on the street last night.

The Mobile Command Unit in Youghal. Image: Jamie O’Hara/Newstalk

Tina was reported missing by her husband Richard on March 24th, 2017, when she was 45 years old.

Gardaí followed hundreds of leads and took statements from well over 100 people; however, no sign of the Fermoy native has ever been discovered.

Gardaí are continuing to urge anyone with any information on the case to contact them.

A family liaison officer has been appointed to Tina’s family.

Reporting from Newstalk’s Southern Reporter Jamie O’Hara in Youghal.