They carried the soaked logs through hundreds of meters of muddy swamps, where the depth of the mud was waist-high, always posing the danger of sinking. If they failed halfway through, they would have to start over.
They used real knives for their underwater combat training. The moment the blades cut through the skin, the ocean water ruthlessly poured into the wounds, painfully unbearable. But as long as they didn't concede, they had to keep fighting, and anyone who lost had to face the punishment of swimming back without any of their gear.
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