The dark, damp air thick with wheeling, twittering swiftlets, and the many accidents on the sheer cliffs. led traditional nest hunters to believe that the huge black caves were the property of spirits, and that if one did not gain the cave spirits 'permission before entering, one would anger them and put oneself in peril.
陰森潮濕的空氣、滿洞飛舞的金絲燕、啼泣的燕聲，加上懸崖絕壁上意外事件頻傳，傳統的採燕人認為，黑暗巨大的燕洞是神靈的財產，必須先經神明允許進入，否則會觸怒洞神，遭到不測。