在地下室墙壁上的一个洞后面，奇里和奇拉发现了一个神奇的隧道。一起加入他们，去参观鼹鼠，去发现充满了发光的花朵的洞穴，去戳戳植物的根，再穿越一个地下湖，和獾一家过夜!这是日本Chirri & Chirra系列的第四本书，这个地下冒险一定会充满魅力和乐趣。

Behind a hole in their basement wall, Chirri and Chirra discover a network of tunnels. Join them as they visit moles, discover caves full of glowing flowers, poke at the roots of growing plants, traverse a subterranean lake, and spend the night with a family of badgers! The fourth book in the Japanese Chirri & Chirra series, this underground adventure is sure to charm and delight.