The head of the Church of Scientology will visit Ireland tomorrow for the grand opening of their vast new centre in Dublin.

Church of Scientology head David Miscavige will supervise the ceremonies to mark the launch of the new complex at Firhouse in Dublin.

The centre - dubbed an 'Ideal Org' in church language - was developed in a complex previously used as a Christian facility.

In 2013, the property involved was the focus of High Court proceedings by the Bank of Scotland over an €18m debt.

It has not been used as a religious centre for four years.

The Church of Scientology is understood to have purchased the property via a third party last year.

The complex was purchased for a reported €6m - less than half what it was valued at in 2010.

However, the future purpose of the huge complex remains shrouded in mystery, with some church experts predicting it could be used as a new European headquarters.

The 'Ideal Org' comes complete with a conference centre capable of hosting more than 1,100 members.

That is several times the total estimated number of Church of Scientology members in Ireland. Two centres are already operated at Middle Abbey Street and in Merrion Square.

It is understood that the new Firhouse complex will be operated by a staff of up to 250, all of whom will be foreign volunteers.

An official at the Church of Scientology centre in Middle Abbey Street declined to comment on the matter.