筆架山的夜晚，總是透著一股說不出的詭異氣息。雖然白天時這裡是登山客的樂園，但一到夜晚，整座山就像披上了一層神秘的面紗，讓人不敢輕易靠近。尤其是那幾座殘破的碉堡，更像是沉睡的怪物，靜靜地隱藏在樹林深處，等待著某個不知名的時刻甦醒。
阿強和他的朋友們對這些傳聞一向不以為然，他們是熱衷夜行的行山愛好者，喜歡挑戰那些少有人走的路線。那天晚上，他們從石硤尾方向出發，目標是登上筆架山頂，俯瞰九龍和維港的夜景。月光微弱，林間的陰影像鬼魅一樣在他們周圍流動，但這些對他們來說並不陌生。他們開著手電筒，說笑著，完全沒把那些關於碉堡的怪談放在心上。
然而，就在他們接近第一座碉堡時，阿強突然停下了腳步。他豎起耳朵，臉上的表情變得凝重起來。「你們聽到了嗎？」他低聲問道。其他人停下腳步，疑惑地看著他。「聽到什麼？」其中一人問。「有聲音……像是收音機。」阿強皺著眉頭，指向前方的碉堡。「就是那邊傳來的。」
大家面面相覷，雖然心裡有些發毛，但還是決定湊過去一探究竟。他們慢慢地靠近那座半塌的碉堡，手電筒的光束在濃密的樹影中搖曳。當他們站在碉堡外時，那聲音變得更加清晰了。果然，是收音機的聲音！雖然斷斷續續，但依然可以聽出是一個女人的聲音，在用粵語播報著什麼。
「這不可能吧？碉堡裡怎麼會有收音機？而且這裡根本沒有電啊！」阿明不安地嘟囔著，但他的聲音顯得有些顫抖。阿強鼓起勇氣，舉起手電筒，朝碉堡的入口照去。裡面一片空蕩蕩，只有濕漉漉的牆壁和散落的枯葉。一陣冷風從入口吹出來，彷彿帶著一絲低語般從他們耳邊滑過。
「也許只是回音吧。」阿強試圖用理智解釋眼前的一切。但就在這時，那聲音突然變得清晰起來。他們聽到了一段話：「各位聽眾，現在是……」接下來的內容卻又被雜音打斷，只剩下沙沙作響的聲音。阿強感覺到背脊一陣寒意，他回頭看了看其他人，每個人的臉色都蒼白得像紙一樣。
「我們還是走吧。」阿明低聲提議，其他人紛紛點頭。他們加快了腳步，離開了那座碉堡。然而奇怪的是，當他們走出幾十米後，那種收音機聲竟然完全消失了。四周只剩下蟲鳴和風聲，一切又恢復了平靜。
回到家後，他們把這件事告訴了其他夜行山的朋友，但得到的回應大多是不以為然的笑聲。「肯定是你們聽錯了。」有人說。「或者只是城市裡的廣播聲，被風吹到山上來而已。」但阿強知道，那絕對不是普通的廣播聲。他無法忘記那種聲音中的古老質感，就像是五、六十年代的收音機廣播，那種帶著沙沙雜訊的音質，不可能是現代科技能模擬出來的。
幾個星期後，他忍不住再次約了幾個朋友，一同前往那座碉堡。他們帶上更好的裝備，包括錄音設備和更亮的手電筒，希望能解開這個謎團。
那天晚上的天氣特別清冷，月亮隱藏在厚厚的雲層後面，整座山顯得格外幽暗。他們沿著熟悉的小路，一路走到那座碉堡前。果然，在距離碉堡還有幾十米時，他們又聽到了那熟悉的聲音。
這次，他們清楚地聽到了一段廣播：「香港市民請注意……」接下來又是一陣沙沙作響的雜音。阿強拿出錄音設備，試圖記錄下這段聲音。然而奇怪的是，錄音設備裡什麼也沒有錄到，只能捕捉到風聲和蟲鳴。
「不可能啊！」阿強低聲咒罵著，再次走近碉堡入口。這次他們決定進去看看。幾個人小心翼翼地跨過破敗的門檻，用手電筒四處照射。裡面依舊空無一物，但牆壁上的斑駁痕跡讓人感到一陣莫名的不安。
就在他們準備離開時，那聲音再次響起，而且這次竟然變得清楚了許多。「香港市民注意……敵軍即將登陸……請做好防空準備……」那是一個男人的聲音，低沉而急促，就像是在發出某種警告。
「天啊！」阿明驚呼。「這到底是什麼鬼東西？」所有人都愣住了，不知道接下來該怎麼辦。突然間，一陣冷風吹過，帶來了一股濃烈的霉味和濕氣。他們感到一陣寒意直透骨髓，就像有什麼東西在黑暗中注視著他們。
「快走！」阿強喊道。他們慌亂地衝出碉堡，一路狂奔下山。回到山腳下時，每個人都氣喘吁吁，臉色蒼白得像見了鬼一樣。
從那天起，他們再也不敢在晚上靠近那座碉堡。但關於那段神秘收音機聲音的傳聞，卻在行山圈裡越傳越廣。有些人說，那是當年駐守山頭的士兵留下的「靈魂印記」，他們在戰爭中遭遇不幸，被困在碉堡裡無法安息；也有人認為，那只是大自然與城市噪音交織而成的巧合。
然而，不管真相如何，每當有人提起筆架山和那座碉堡時，都會感到一股莫名的不安，就像那段古老而神秘的收音機聲音仍在耳邊迴盪。不少人開始相信，也許在某個深夜，那些被遺忘已久的聲音還會再次響起，就像從另一個時空傳來的一段訊號，一段無法解釋、也無法忽視的訊號。
English Version
At night, Beacon Hill in Hong Kong takes on a character entirely different from its daytime tranquility, as the familiar hiking paths and scenic viewpoints fade into shadow, replaced by an atmosphere that feels heavy with memory and unease, and among the most unsettling features hidden within its forested slopes are the abandoned bunkers, crumbling relics of a past military presence that now sit silently among the trees like forgotten sentinels, their dark interiors suggesting that something within them has not entirely faded away. Ah Keung and his group of friends, all avid night hikers who enjoyed exploring lesser-known routes, had long dismissed the stories surrounding these bunkers as exaggerated tales born from imagination, and on one particular night, they set out from the Shek Kip Mei side with the simple goal of reaching the summit to admire the night view over Kowloon and Victoria Harbour, carrying flashlights and joking among themselves as they walked, unconcerned by the legends that had unsettled others before them. The moonlight was faint, often obscured by drifting clouds, and the shadows of the forest seemed to shift with every movement of their lights, yet none of this struck them as unusual until they approached the first bunker, where Ah Keung suddenly stopped and raised his hand for silence, his expression changing as he strained to listen to something that the others had not yet noticed. When they focused, they too began to hear it, a faint, intermittent sound that seemed out of place in the stillness of the mountain, a sound that resembled a radio broadcast, crackling softly as though transmitted from a distant and unstable source. The realization unsettled them, as there should have been no such sound in that isolated location, especially not within an abandoned bunker with no electricity or equipment, and yet as they moved closer, the sound grew clearer, revealing what seemed to be a woman’s voice speaking in Cantonese, though much of it was obscured by static and distortion, making it impossible to understand fully. Uneasy but curious, they approached the entrance of the bunker, shining their flashlights inside to reveal nothing but damp walls, scattered leaves, and the lingering smell of moisture and decay, and yet the voice continued, echoing faintly as if it were coming from somewhere deeper within the structure or perhaps from nowhere at all. Trying to rationalize what they were experiencing, Ah Keung suggested it might be an echo of distant city broadcasts carried by the wind, but even as he spoke, the voice suddenly became clearer, forming a phrase that cut through the static: “Attention, listeners, the time is…” before dissolving once again into a hiss of noise. The group exchanged uneasy glances, their earlier confidence replaced by a growing sense of dread, and though they quickly decided to leave, the moment they moved away from the bunker, the sound vanished completely, leaving behind only the natural sounds of the forest as if nothing unusual had ever occurred. Back in the city, they shared their experience with other hikers, most of whom dismissed it as coincidence or imagination, suggesting that radio signals from urban areas could occasionally travel in unpredictable ways, yet Ah Keung remained unconvinced, unable to shake the feeling that what he had heard was not modern at all, but carried a distinctly old quality, reminiscent of mid-20th-century broadcasts with their characteristic static and tonal texture. Driven by a need to understand, he returned weeks later with better equipment, including recording devices, accompanied by friends willing to investigate further, and on that colder, darker night, as they approached the same bunker, the sound returned once more, this time even more distinct than before. They heard a voice clearly announcing, “Citizens of Hong Kong, please be advised…” before the transmission broke again into static, sending a chill through the group as Ah Keung quickly activated his recording device, only to discover that it captured nothing but wind and insects, as though the broadcast existed only within their perception and not in any physical form that could be recorded. Determined to find the source, they entered the bunker, their flashlight beams cutting through the darkness to reveal the same empty interior, yet the voice persisted, now joined by a sense of presence that none of them could ignore, and then, without warning, the message became unmistakably clear, a man’s voice this time, urgent and authoritative, warning of an imminent enemy landing and urging preparations for air defense, words that seemed to belong to another era entirely, echoing the wartime history of the site. The sudden clarity of the message left them frozen in place, unable to move or speak as the weight of what they were hearing settled over them, and at that moment, a cold wind swept through the bunker, carrying with it a strong smell of dampness and decay, intensifying the feeling that they were not alone, that something unseen was watching from the shadows. Panic finally broke their paralysis, and they fled the bunker, running down the mountain without looking back until they reached the safety of the lower trails, where they could finally stop and catch their breath, their faces pale and their minds struggling to process what had just happened. From that night onward, none of them returned to the bunker after dark, yet the story spread among the hiking community, growing into one of the most discussed mysteries associated with Beacon Hill, with some believing the phenomenon to be a residual imprint of wartime communications somehow embedded within the environment, replaying under certain conditions like an echo across time, while others insisted it could be explained by natural acoustics and distant signals carried unpredictably through the terrain. Regardless of the explanation, the legend of the bunker radio persists, and on certain nights, when the air is still and the mountain is quiet, there are those who claim that the faint sound of an old broadcast can once again be heard drifting through the trees, a fragment of history that refuses to remain silent, calling out from a time long past, waiting for someone to listen closely enough to hear what it is trying to say.