I take it that no other whale can hear him, but he can hear them. He's effectively mute (to them). However, loss of one sense is often compensated for by acut

I take it that no other whale can hear him, but he can hear them. He's effectively mute (to them). However, loss of one sense is often compensated for by acuteness in other senses. If he can hear them, he can find them. Might he not have other ways of communicating? Whale sign language when near, or voiceless noises when far away? I'm hopeful.