Two military radios for a treasure location was a worthy deal. Li Du felt that way, at least, so he agreed.
Thus, he got a map, a detailed hand-drawn map of a spot in the Arctic Ocean.
"It won't be easy to find the hidden cemetery. You'll have to cross the ice caps and straits, and eventually dive into the water, and you'll have to know that narwhals don't die in the shallows," said the old man with the plait.
Li Du tapped the map and said, "Are you sure this is useful?"
The old man took out an official map and compared the two. Both maps were almost the same, except that the hand-drawn version had a smaller scale and described some characteristic landmarks, which the official map did not include.
Veterans were masters at cartography, and in their era had to be able to hand-draw maps, which was an important job during the war.