SB 8.20.34
padam dvitiyam kramatas trivistapam
na vai trtiyaya tadiyam anv api
urukramasyanghrir upary upary atho
mahar-janabhyam tapasah param gatah
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
As the Lord took His second step, He covered the heavenly planets. And not even a spot remained for the third step, for the Lord’s foot extended higher and higher, beyond Maharloka, Janaloka, Tapoloka and even Satyaloka.
Purport by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
When the Lord’s footstep exceeded the height of all the lokas, including Maharloka, Janaloka, Tapoloka and Satyaloka, His nails certainly pierced the covering of the universe. The universe is covered by the five material elements (bhumir apo ’nalo vayuh kham). As stated in the sastra, these elements are in layers, each ten times thicker than the previous one. Nonetheless, the nails of the Lord pierced through all these layers and made a hole penetrating into the spiritual world. From this hole, the water of the Ganges infiltrated into this material world, and therefore it is said, pada-nakha-nira janita jana-pavana (Dasavatara-stotra 5). Because the Lord kicked a hole in the covering of the universe, the water of the Ganges came into this material world to deliver all the fallen souls.
Thus end the Bhaktivedanta purports of the Eighth Canto, Twentieth Chapter, of the Srimad-Bhagavatam, entitled “Bali Maharaja Surrenders the Universe.”