Problems: Marine Biodiversity ・ Biodiversity.
Ultrasound internet, using StarLink to connect dolphins in different regions, to learn from each others.
Ultrasound could be made into a TV, and let dolphins learn from each others' experiences, and maybe even perform to make movies.
Dolphins are very social animals: https://www.youtube.com/watch?v=7VTWA0ofzZo.
Related idea: Dolphion Chatroom Libraries
Create a low bandwidth distant communications channel for groups of dolphins with exchanged member, and crack dolphin language much faster!