何も聞こえなかった

couldn't hear anything

→ 何
phrase Rare #20,529
couldn't hear anything 何も means “anything/nothing” in negative sentences, and 聞こえなかった means “could not be heard” or “couldn't hear.”
JA: 周りがうるさくて、先生の説明が何も聞こえなかった。
EN: It was so noisy that I couldn't hear anything the teacher was explaining.

何も聞こえなかった

I couldn't hear anything.

本当に何も聞こえなかった

Did you really not hear anything?

何も聞こえなかった

I couldn't hear anything.

— グッドフェローズ (1990)

何も聞こえなかった

I couldn't hear anything.

もう何も聞こえなかった

I couldn't hear anything anymore.

— Carandiru (2003)

何も見てない何も聞こえなかった

I didn't see anything, and I didn't hear anything.