By a cord of Virana roots, having only one thread entire. Even that one thread was gradually being eaten away by the rat, living in that hole.
एकतन्त्ववशिष्टं वै वीरणस्तम्बमाश्रितान्। तं तन्तुं च शनैराखुमाददानं बिलेशयम्॥