To the YouTube user's credit, the caption points out that the shark is not being aggressive. In fact, the caption admits that the shark was lured there by food, in a practice called "chumming" or baiting. And that's what appears to have left the terrified shark stuck and bleeding in the cage.
"I believe this unfortunate incident was due to the boat operators acting illegally," Candace Crespi, campaign director at Oceanic Preservation Society (OPS), told The Dodo. "In Guadalupe, [California], chumming or baiting over or on a shark-diving cage is prohibited. There are plenty of sharks in this area to observe without force feeding the wild animals."
The dramatic footage shows a recreational activity that's popular along the coasts of California, Mexico, South Africa and Australia, and can do animals more harm than good.