The boys spot a pod of whales and the skipper immediately tries to harpoon one. He fails due to the shoddy construction of his harpoon. The Calypso crashes into a whale, damaging some equipment, but thankfully the whale isn't grievously wounded. (49:00-52:00)
A baby whale is badly lacerated by the Calypso's propeller. Cousteau blames it for being careless. The captain harpoons and then shoots it. The carcass attracts dozens of hangry sharks. (52:05-55:15)