On July 11, 1897, Andrée, Strindberg, and Fraenkel flew northward and disappeared from view never to be seen alive again. It can not be overstated how this expedition had caught the imagination of the nation of Sweden and the rest of the world. When they did not return, when there was no sign of them, it was unthinkable to everyone that it had failed.
Their bodies and the remains of their expedition were found in 1930 on White Island. Among the journals and letters were also photographs that showed their final months from beyond the grave.
Once on foot, the men pulled sledges and boats filled with up to 350 lbs of gear and provisions over the ice floes.
When winter began to set in, they realized that they needed a shelter. The built a house of ice and snow on an ice floe. Strindberg designed it and built it. Andrée christened it "home". Shortly after it was built, while the men were sleeping, the ice floe upon which it sat broke in half right at the wall where they slept. They were forced to evacuate to White Island. There they gathered supplies to build a new shelter. And there they mysteriously died. Strindberg died first as he was the only one who was buried. Shortly after that Andrée and Fraenkel died. One theory was that they were cooking in their tent and died of carbon monoxide poisoning. Andrée was found sitting upright over a cook stove that still had fuel in it. Fraenkel was lying down a few meters away.
No matter how they died, they were heroes when their bodies were finally returned to Sweden. Here is a photograph of their funeral 33 years after their deaths.