Canto 1 - Boyhood
Bāla-kāṇḍa
Chapter 40: Lord Kapila Punishes Sagara’s Sons
Text 1.40.6

सगरस्य च पुत्राणां प्रादुरासीन्महात्मनाम्।
पृथिव्यां भिद्यमानायां निर्घातसमनिःस्वनः॥

sagarasya ca putrāṇāṁ prādurāsīn mahātmanām
pṛthivyāṁ
bhidyamānāyāṁ nirghāta-sama-niḥsvanaḥ

sagarasya ca putrāṇām = the sons of Sagara; prādurāsīt = happened; mahā-ātmanām = greatly intelligent; pṛthivyām = through the earth; bhidyamānāyām = while digging; nirghāta-sama-niḥsvanaḥ = to hear a loud noise like that of an earthquake.

The greatly intelligent sons of Sagara heard a loud noise like that of an earthquake when they dug through the earth.