On the flip side, the concern of locals at Stewart Island and divers was that the use of berley and decoys was changing sharks' behaviour, so much so that sharks were allegedly following vessels in expectation of food, putting divers and all those who entered the water at greater risk. In particular—and a concern that is easily understood—is locals at Stewart Island feeling unsafe while they or their children swim at a popular beach within 10 kilometres of the operating area. While there may be no scientific evidence that these operations are changing the behaviour of sharks, it is not difficult to comprehend the concern of those using waters in the vicinity of the activity. As the businesses grew in popularity and tensions rose, an anti - shark cage diving Facebook page was created, and, in June 2015, a petition was even presented to Parliament calling for the activity to be banned. 