Fr. Hewko preached about an episode in Spanish history, which is analogous to our current situation. The cave is a situs talked about in the sermon.
The sermon is incredible, BTW. Just magnificent.
FR. PFEIFFER: "Essential Sermon Mustard Seed and Paleo resistance in 722 Covadonga Spain compared to present SSPX Crisis. Silence kills souls." Fr Pfeiffer
Eglisemilitante
Paleo resistance = early history of the Church episode involving resistance against compromise
722 = year of herein referenced Spanish conflict
Cova Donga, Spain = cave serving as resistance headquarters
Silence kills souls = Silence kills souls