तदा then, तमश्च by darkness, लोकम् world, अव्रते engulfed, दिशश्च even the directions, नचकाशिरे not noticeable, चाशसरांसिसरितः Furthermore rivers, प्रतिचुक्षुभिरे got agitated.

Then darkness engulfed the world, the directions were not noticeable and further the rivers were agitated.