Singing louder than any animal on earth, humpback whales are famous for their haunting songs and jaw-dropping acrobatics. They were hunted to the brink of extinction until a moratorium on killing them was implemented in the 1960s. But after finally rebounding in numbers, whaling nations are exploring ways to re-open the hunt. In Antarctica, Japan is targeting minke, fin and now...humpbacks. The tiny island nation of Tonga in the remote South Pacific is a haven for the magnificent mammals. With few natural resources or other means of income, the country is considering opening its waters to foreign whaling fleets in exchange for hard currency. The merits and legitimacy of scientific whaling by Japan and other nations is hotly debated. The iconic species is a favorite of whale watchers from Alaska to Mexico and the stage is set for an epic battle between whalers and conservationists. Humpbacks: From Tonga to Antarctica also features Paul Watson of the Sea Shepherd Society.