防空洞
Air Raid Precaution Tunnel
防空洞的確切位置對居民來說是個謎，但很多人都認為入口位於科士街臨時遊樂場 (前牛棚位置)及前堅尼地游泳池。而根據政府紀錄，這條廢棄的神秘21號防空隧道靠近觀龍樓的電梯大樓。 這條隧道並沒有接駁其他複雜的地下網絡，而且也相對較短，因此不容易被發現。相關文獻亦記載這條隧道曾被命為「9號空襲隧道」並儲存炸藥，在第二次世界大戰期間用作市區的防火道。
The exact location of the air raid precaution tunnel is a mystery to the locals, but many suggested that the entrance was somewhere near Forbes Street Temporary Playground (ex-cattle depot) and the former Kennedy Town Swimming Pool. Government records refered it as No. 21 of the Disused Air Raid Precaution Tunnel, which is seemingly close to the Lift Building of the Kwun Lung Lau. It does not connect to any complicated underground network and it is relatively short in length. Archives suggest that it was previously named No. 9 Air Raid Tunnel and used to store dynamites to create firebreak in the urban areas during World War II.