International ocean experts deliver talks in Beijing about saving the seas, Li Yingxue reports.

Underwater photographer David Doubilet and his wife, Jennifer Hayes, were sharing stories at Ocean Talks－from an encounter with a mother seal and her son to revisiting a coral after nine years.

The US couple's photos brought the audience into the Earth's tripolar regions of the Antarctic, Arctic and the Coral Triangle, showcasing the beautiful scenes and recent changes.

"Pictures have power. They have power to celebrate, and they have power certainly to humiliate," says Doubliet.