Tunnel 88 was originally an air raid shelter. It was bored into the base of a granite hill, so it stays at a relatively even temperature, warm in winter and cool in summer. That makes the tunnel ideal for long-term aging. As time goes by, odd and impure tastes in the liquor are eliminated.
馬祖原來的居民防空洞「八八坑道」，因為從花崗岩的山腳下開鑿，冬暖夏涼，氣溫穩定，特別適合長時間儲存美酒，雜味、異味在時間中慢慢醇化。