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本冊書主要講述四個孩子在鄰居廢棄的老屋中發現了一個秘密通道，到底是誰建立的秘密通道？這是用來幹什麼的？孩子們又在秘道裏發現什麼秘密呢？少年探險隊是時候出發啦！每一次進入地道都是一場驚心動魄的體驗，由於嚴重缺氧等問題，少年探險隊們每一次都不能堅持太長時間，他們能夠克服種種困難完成這一次冒險嗎？
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