Two Australian aviators survived after a firefighting helicopter nosedived into a river on the Indonesian side of Borneo on Sunday, a crash that underscores the dangers facing foreign pilots hired to battle one of the country's worst land-fire seasons in more than a decade.

The aircraft was scooping water from the Barito River in South Kalimantan when it lost altitude and hit the surface, according to Indonesia's National Disaster Mitigation Agency, BNPB. Video circulated on social media showed the rotorcraft dipping low over the water before the sudden plunge. BNPB spokesperson Berton SP Panjaitan said investigators were compiling a full chronology and would release it to authorities and the public.

What Jakarta has confirmed

BNPB said both Australians were alive and receiving medical attention. Late Sunday, Indonesia's search-and-rescue agency Basarnas recovered the body of an Indonesian crew member who had been aboard the helicopter. The agency did not immediately release the victim's name or hometown.

The helicopter was under contract to support BNPB missions that routinely move between Banjarmasin, Pontianak and Surabaya, Panjaitan said. Flight-tracking data reviewed by the ABC showed the aircraft leaving Banjarmasin earlier on Sunday before heading toward fire-affected areas in Kalimantan—the Indonesian portion of Borneo—where peat and plantation blazes have burned across more than 1.9 million hectares this year by one satellite monitor's count.

A brutal fire season

Indonesia's environment ministry has mobilised more than 100,000 personnel against fires that have sent toxic haze across parts of Southeast Asia. Health officials have recorded hundreds of thousands of acute respiratory infections domestically. Police have named more than 240 individuals and 20 companies as suspects in deliberate or negligent burning tied to land clearing.

Sunday's crash was not the week's first aviation loss in the fire fight. Three Indonesian crew died when another water-bombing helicopter went down in Central Kalimantan earlier in the week while loading water, according to Australian broadcaster reports from the scene. That aircraft was carrying eight people.

Canberra's stake in the response

Australia regularly loans firefighters, aircraft and reconnaissance expertise to neighbours during severe ASEAN fire seasons, and commercial operators frequently win short-term contracts to fly heavy helicopters in Indonesia's archipelago. The Department of Foreign Affairs and Trade has not yet issued a detailed statement on Sunday night's crash, but consular staff typically contact next of kin when citizens are hospitalised overseas.

For now, Basarnas and BNPB crews remain at the Barito River site, where residents helped drag wreckage toward the bank. Investigators will examine maintenance records, fuel loads and whether river currents complicated the water pickup. With months of dry weather still possible under the lingering El Niño pattern, fire bosses may keep demanding long hours from the same small pool of aerial crews—making every nosedive into a muddy river a reminder of how much of the region's fire season now depends on rented steel and borrowed pilots.