After having the club ground to bits, King Āhuka [Ugrasena] of the Yadus personally threw the pieces, along with the remaining lump of iron, into the water of the ocean.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
तच्चूर्णयित्वा मुसलं यदुराजः स आहुकः । समुद्रसलिले प्रास्यल्लोहं चास्यावशेषितम्
taccūrṇayitvā musalaṃ yadurājaḥ sa āhukaḥ | samudrasalile prāsyallohaṃ cāsyāvaśeṣitam
SB 11.1.21