The tandem experiment is a very clever way to have them communicate. This doesn't exactly prove anything about a language but it is a good way to obtain valuab

The tandem experiment is a very clever way to have them communicate. This doesn't exactly prove anything about a language but it is a good way to obtain valuable sound data. I wonder if higher order training could be achieved. I.e. Instructor signal one dolphin a secret command, dolphin communicate with second dolphin and second dolphin does the trick - to test if sounds used to organize the tandem are the same or related in any way to sounds used to relay the secret.