Unfortunately, human communication is extremely complex. Researchers are only beginning to scratch its surface. The current approach is to fit them with helmet

Unfortunately, human communication is extremely complex. Researchers are only beginning to scratch its surface. The current approach is to fit them with helmets that project sounds and images of boats for the humans to sail in. Then it's just a matter of shooting the relevant humans with non-lethal darts and fitting them with the helmets. However, that's easier said than done. And there are latency issues with the helmets. (Not to mention early research suggesting they become less likely to mate, plus a whole host of health issues which we don't see in the wild.)