The audience could guess the outcome already, after all, they knew the mystery's solution, so reasoning backward wasn't difficult.
On the fourth day of departure, Scott's track tractors were already badly damaged. In the severe cold, the oiling system completely seized up. It was unrepairable and unable to be refueled, turning the tractors into heaps of scrap metal.
Subsequently, the supplies from the tractor were transferred to the backs of the Siberian ponies.
In the extreme cold, the Siberian ponies' poor resistance to cold struggled to adapt to the harsh conditions of the Antarctic plateau. Even with sufficient food and drinking water, their strength was insufficient to cope with the continuous low temperatures and the high loads they had to carry.
One by one, the Siberian ponies collapsed. With no other options, the members of Scott's expedition were forced to drag the supplies themselves, struggling forward through the blizzard-covered ice fields.