According to other sources, Hedin had neglected to completely fill the drinking water containers for his caravan at the beginning of the expedition and set out for the desert with only half as much water as could actually be carried. When he noticed the mistake, it was too late to return. Obsessed by his urge to carry out his research, Hedin deserted the caravan and proceeded alone on horseback with his servant. When that escort also collapsed from thirst, Hedin left him behind as well, but managed to reach a water source at the last desperate moment. He did, however, return to his servant with water and rescued him. Nevertheless, his ruthless behavior earned him massive criticism.