C147 Subterranean chamber

After Lin Feng bid farewell to Sai Sile and the others, he did not immediately search for the pocket dimension but instead went to the far east prairie.

Lin Feng remembered that the Lin Feng in the original book comprehended the secrets of "Sound Wave" in the Great Plains's Mountain Range of Death. But right now, he didn't have any clue as to how to use the 'sound wave'