I can try but they weren't cryptic or anything, just didnt make sense to the humans. The humans were swimming underwater and using some tech to translate. They asked the dolphins if they missed the oceans of earth or something to that effect and the dolphins mention that they miss the "great voices" which is implied to be a reference to whales. There were also some casual-seeming phrases that were essentially just word salad to the humans, and they compared it to speaking to a 1 year old human. They end the interaction with the dolphins saying over and over that there are no sharks there and that they miss them, which makes no sense to the narrator so he turns off the translator with the realization that he just can't understand what they mean because they share no mutual contexts. edit: also presumably part of the problem was that the human's questions were just as context-less to the dolphins as the dolphin answers were to the hupeople