tasya hrade viharato bhuja-danda-ghurna-
var-ghosam anga vara-varana-vikramasya
asrutya tat sva-sadanabhibhavam niriksya
caksuh-sravah samasarat tad amrsyamanah
Krsna began sporting in Kaliya’s lake like a lordly elephant — swirling His mighty arms and making the water resound in various ways. When Kaliya heard these sounds, he understood that someone was trespassing in his lake. The serpent could not tolerate this and immediately came forward.
According to the acaryas, Lord Krsna was producing wonderful musical sounds within the water simply by splashing His hands and arms.