Ramayana
सगरस्य च पुत्राणां प्रादुरासीन्महास्वनः । पृथिव्यां भिद्यमानायां निर्घातसमनिःस्वनः ॥ १-४०-६
When the sons of Sagara were digging the earth then there emerged an unbearable noise similar to the crashing of a thunder. ॥ 1-40-6॥
english translation
sagarasya ca putrANAM prAdurAsInmahAsvanaH । pRthivyAM bhidyamAnAyAM nirghAtasamaniHsvanaH ॥ 1-40-6
hk transliteration by Sanscript