Some friends and I looked into the Thor’s Cave dolphins years ago. We wondered whether the bones were brought there for ritual/worship. Possibly from the East coast via The Humber, as our rivers end there. There is a Goddess called Nehellenia/Nehalennia, a variant of the Goddess Hel or Holle, after whom Holland was named. German verb ‘helan’ – to hide. She is the Goddess of healing, death and rebirth. Nehellenia was invoked by sailors before they crossed the North Sea. Altars and artefacts dedicated to her were found in Holland after the great storm in 1646. Soil that had buried them was washed away. Two coastal shrines were found at Domburg and Colijnsplaat in The Zealand region.