A suspected “whirlpool” appeared on the water surface of the Qiantang River on the east side of the Fuxing Bridge. At the time of the incident, a large number of dense white bubbles appeared on the surface of the Qiantang River, and there was no smell at the scene. The leakage of subways and gas pipelines has been ruled out, and the cause of the current “whirlpool” is unknown. Well almost!
A mysterious whirlpool in Qiantang River, which created an online sensation on Wednesday, was the result of naturally occurring methane gas and foaming agents used in the construction of a subway tunnel, according to experts.
Water rose from the riverbed to the surface, and white foam accumulated and spread across an area of 800 square meters in the Hangzhou City river, sparking speculations that ranged from it being a water monster, to a stealthy discharge of polluted water, to a safety incident related to the nearby Metro Line 5 construction site.
The whirlpool lasted about 20 minutes.
After being notified of the incident, local police investigated the site but found nothing abnormal. The city’s water supply and natural gas authorities also reported no problems related to their pipeline facilities.
Experts later told Qianjing Evening News the phenomenon was a natural result of a combination of methane gas and environment-friendly substances used to increase lubrication while building the underwater tunnel.