- Wanita Selam Indonesia
- 1,014 square metre(s)
- Indonesia (Manado)
The largest flag unfurled underwater measures 1,014m² (11,042 ft² 46 in²) and was achieved by the Indonesia Women's Organisation (WASI) (Indonesia) in Manado, North Sulawesi, Indonesia, on 3 August 2019.
The Indonesia Women's Organisation (WASI) achieved three Guinness World Records titles in 2019 the first one on 1st August for the longest human chain underwater. Then on the 3rd of August they achieved the most people scuba diving simultaneously and the largest flag unfurled underwater.