Kernrechtsfrage
Whether the respondents were liable under Art. 55(1) OR for the alleged hearing injury caused by construction noise
Extrahierter Entscheid
No liability was established because the alleged extreme noise was an unforeseeable extraordinary event; no special preventive measures were required.
Extrahierte Begründung
The court accepted that a short, very loud high-frequency noise occurred, but found no indication of extreme events beyond ordinary deep-construction noise. Art. 55 OR does not impose liability for extraordinary, unforeseeable events; the workers' hearing protection did not make such events foreseeable.