With the COVID-19 epidemic and recent upheaval in society we saw a glimpse of what it is like to attend the Holy Sacrifice of the Mass in secret. It's quite evident that in the future the practise of Catholicism will have to go underground. It's happened in the past and will happen again if history teaches us anything.
Here is just one small example: "After the Reformation in the 17th century, the newly converted Protestant Dutch government officially outlawed Catholicism, forcing believers to practise their faith in secret. This led to the construction of secret Catholic churches around Amsterdam, including one chapel in de Wallen, known as Ons’ Lieve Heer op Solder, which was hidden inside the upper floor of a canal house."
