Jaskinia Zimna (Tatra Mts)
A 5.4 km cave on the eastern slope of Dolina Kościeliska (176 m vertical range) whose lower series ends in sumps (Zwolińskich, Ogazy, Warszawiaków). Historic diving accidents are recorded (1958 near-fatal incident, 1966 death in Syfon Ogazy). A Polish Caving note reports Krzysztof Starnawski diving the final fourth sump of the lower series; the outcome could not be read. Open to cave climbers per pl.wikipedia, with a grate near the lower entrance.
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