Vu Thi Thinh perches on the edge of her small wooden boat and plucks a polystyrene block from the calm waters of Vietnam's Ha Long Bay.
It's not yet 9 o'clock, but a mound of styrofoam buoys, plastic bottles and beer cans sit behind her.
There are signs that the human impacts have degraded the UNESCO World Heritage Site, which is famous for its sparkling turquoise waters dotted with towering rainforest-topped limestone islands.
I feel very tired because I collect trash on the bay all day without much rest, said Thinh, 50, who has been working for close to a decade as a trash picker.
He has to make ten to seven trips on the boat every day to collect it all. The Ha Long Bay management board has said 10,000 cubic metres of waste - enough to fill four Olympic swimming pools - have been collected from the water since the beginning of March.
The trash problem has been particularly severe over the past few months, as a plan to replace styrofoam buoys at fish farms with more sustainable alternatives backfired and fishermen chucked their redundant polystyrene into the sea.
The State Department ordered 20 barsges, eight boats and a team of dozens of people to launch a clean-up.
Do Tien Thanh, a conservationist at the Ha Long Bay Management Department, said the buoys were a short-term issue but admitted: Ha Long Bay is under pressure.