Peng Yu Sai is an investigative documentary that dives into the illegal trade in Manta Rays from India's oceans. Through this documentary, wildlife presenter Malaika Vaz follows the illegal trade pipeline from fishing vessels in the Indian Ocean, to the Indo-Myanmar border and finally undercover in the wildlife trafficking hubs of Hong Kong and Guangzhou, in China. Along the way - she meets with fishermen, middle men, traffickers, armed forces personnel and wildlife trade kingpins, as she tries to understand what it will take to protect these magnificent ocean giants.