A group of divers in New Zealand are retrieving ghost nets from the ocean to save marine life. See how they do it and what becomes of the upcycled net. | National Geographic

Diving deep into the ocean to retrieve ghost nets is exhausting, thankless and often even life-threatening. But fuelled by his love for the ocean, 66-year-old Hongkonger Harry Chan does it tirelessly, simply because "someone's got to do it". | South China Morning Post