Zoo Vouchers for Evacuated Residents as Swiss University Moves Ultra-Toxic Chemical

Precautionary evacuation of 270 people near ETH campus for removal of hazardous chlorine trifluoride cylinder; residents compensated with zoo tickets.

Around 270 people living near the ETH Zurich campus were ordered out of their homes on Sunday – and later compensated with tickets to the city zoo. The reason: a single gas cylinder containing chlorine trifluoride, a substance so volatile it must be handled under airtight conditions, was being removed from a university research stockpile.

ETH Zurich stressed the operation was purely precautionary and not triggered by any accident or leak. Still, the university brought in a specialist disposal firm from Germany to manage the move.

Evacuation window and transport window

The evacuation began at 10 a.m. and was scheduled to last until approximately 4:30 p.m. The actual removal of the cylinder took place around midday. Authorities confirmed all procedures ran to plan.

Before transport, the German company's experts sealed the gas bottle inside an airtight container, a necessary step given chlorine trifluoride's reputation for extreme toxicity and explosive potential. The chemical came from an earlier research inventory at the university.

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Street closures and tram disruptions

A security cordon stretched across several streets near the ETH campus. The affected area included Tannenstrasse, Sonneggstrasse, Leonhardstrasse, Clausiusstrasse, Weinbergfussweg and Universitätsstrasse. Police and university staff managed the barriers to keep out unauthorised personnel during the loading process.

Public transport also took a hit. Multiple tram lines were unable to serve stops inside the evacuation zone until the operation was complete.

Compensation – and a return home

Once the cylinder was safely away, the street closures were gradually lifted and residents were allowed back into their apartments. As a goodwill gesture, ETH Zürich offered each affected household vouchers for the Zürich Zoo, describing the evacuation as a precautionary measure rather than a response to an emergency situation.