Answer: A rubber dinghy
During the filming of 'Jaws 2', the scene in which Chief Brody electrocutes the shark was a challenge for the crew since they needed to ensure the safety of the actors and equipment involved. In the scene, Chief Brody sits on a rubber dinghy with a power cable in his hands. The dinghy was necessary to keep the actor out of the water while the electrified cable was being maneuvered to shock the mechanical shark. However, the use of the rubber dinghy caused a problem during the filming as it bounced whenever there was a wave, creating an unexpected movement for the actor and the equipment. To solve this issue, the crew placed sandbags in the dinghy to weigh it down and provide some stability. This small detail shows the intricate planning and problem-solving required behind the scenes to achieve suspenseful scenes in the movie.