Yantarnyy zamok (S)

A young fisherman, Castystis, went to sea to catch fish for a sacrifice to the god Perkunas. In the sea he met the sea princess Yurate, the formal bride of Perkunas. For trying to touch her, Perkunas drowned the fisherman's boat with lightning. Yurate saved Castystis and sheltered him in her underwater amber palace, where the fisherman danced with her and entertained her playing on the pipe. In the meantime, the mother of Castystis was grieving on the shore.