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There already exists the underground Church.

See snippet below as a reference, taken from the following article at link:

Now What?
Being a Real Catholic while the Church is in Eclipse

So then, the big question is: Where is the nearest church for you? Where can you go to Mass? Where can you go to confession? Where can you get spiritual direction? While we do not wish to endorse (or not endorse) any particular church, we would nevertheless like to give some general guidance and suggest you use the following directories of sedevacantist Masses:

Fr. Hector Lazaro Romero’s Directory of Non-Una Cum Mass Centers (PDF)

Lux Vera Directory of Mass Locations in the United States

Lux Vera Directory of Mass Locations in the World (outside the United States)

Sedevacantist Mass Centers (Global Map View / current as of Sep. 2017)

The contents of these directories are explained well at the links above. Look for a Mass location that is close to you, and keep in mind that you may have to go across state or country lines for your nearest Mass. The editors of these directories try hard to ensure that all of the Masses listed are sedevacantist, that is, as far as they know, the clergy who offer them profess the true Catholic Faith, are validly ordained, and do not profess communion with any false papal claimant or the Vatican II Sect. However, sometimes mistakes may creep in, so if you discover one, please contact the editors of the respective directory and let them know. If you are unsure, please contact us and we will try to advise you.