Recently, a tranquil lake in Sichuan province unexpectedly emitted ‘biubiu’-like sounds, sparking online speculation and curiosity. After investigation by local authorities, the noise was confirmed not to originate from mysterious creatures or supernatural causes, but rather from methane gas—commonly known as marsh gas—bubbling up from the lakebed under specific hydrological and meteorological conditions. This phenomenon is not uncommon in still, organic-rich lakes, especially when temperatures rise, water stratification shifts, or water levels drop. Experts explain that methane is naturally produced by microorganisms decomposing organic matter in lake sediments. When enough gas accumulates and breaks through the water’s surface tension, it creates popping or ‘biubiu’-like sounds as bubbles burst. Although the noise may sound eerie, it is generally harmless and reflects normal ecosystem processes. As a precaution, local officials have enhanced water quality monitoring and advised visitors against using open flames near the lake to prevent potential fire hazards from accumulated flammable gases. This incident serves as a reminder that nature is full of intriguing sounds—and scientific explanations are often more reliable than urban legends.
近日，四川一处原本平静的湖面突然传出‘biubiu’声，引发网友热议和好奇。经当地相关部门调查，该声音并非来自神秘生物或超自然现象，而是由湖底释放的沼气（主要成分为甲烷）在特定水文和气象条件下冒出水面时产生的气泡破裂声。这种现象在富含有机质的静水湖泊中并不罕见，尤其在气温升高、水体分层变化或水位下降时更容易发生。专家指出，沼气是水底沉积物中微生物分解有机物的自然产物，当气体积聚到一定程度并突破水体表面张力时，便会发出类似‘biubiu’或‘噗噗’的声音。尽管听起来略显诡异，但此类现象通常无害，属于自然生态系统的正常表现。不过，为安全起见，当地已加强水质监测，并提醒游客勿在湖边使用明火，以防可燃气体积聚引发危险。这一事件也再次提醒公众：大自然充满奇妙声响，科学解释往往比都市传说更值得信赖。
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