Matsya Purana — Tripura Takes Refuge in the Ocean; Maya’s Hidden Nectar-Reservoir and the God...
ततो ऽमरामरगुरुं परिवार्य भवं हरम् नर्दयन्तो ययुस्तूर्णं सागरं दानवालयम् //
tato 'marāmaraguruṃ parivārya bhavaṃ haram nardayanto yayustūrṇaṃ sāgaraṃ dānavālayam //
Then, surrounding Bhava—Hara (Śiva), the revered preceptor of both gods and antigods, they roared aloud and swiftly set out for the ocean, the stronghold and dwelling-place of the Dānavas.
This verse does not describe Pralaya directly; it depicts a martial mobilization toward the ocean, portraying the ocean as a strategic cosmic domain where divine order is defended against Dānavas.
By analogy, it reflects rājadharma themes: rallying around a capable leader, acting swiftly against threats, and protecting order—principles often extended in Purāṇic ethics to governance and disciplined household life.
No explicit Vāstu or ritual procedure is stated; the key takeaway is the sacred-geographic framing of the ocean as a ‘seat’ (ālaya) of hostile forces, a common Purāṇic way of mapping moral conflict onto places.