This fantastic reservoir just beyond the city centre was serendipitously created when the limestone quarry operating here accidentally pierced the water table. Though officially prohibited and the site of frequent accidents, the irresistible blue, seemingly bottomless water is immensely popular with locals for swimming and cliff diving in summer. If you want to get in on the action we recommend you do so through the scuba diving school that operates here; the depth varies from 7-21m (23-69ft) and the bottom is cluttered with all kinds of things that shouldn’t be there: several vehicles and sunken boats, as well as the former changing rooms of the quarry workers. The surrounding limestone bluffs and woods are an additional attraction - a favoured place for summer barbecues, ideal for hiking and a favourite for local rock-climbers, whose anchors you may notice sticking out of the cliff faces. The area is also the fabled former stomping ground of Kraków's legendary alchemist and occultist Pan Twardowski, who purportedly had his workshop in one of the caves. Nearby, intrepid adventurers may also discover access to large, abandoned and very creepy Austrian bunkers carved in the cliffs (though most have been sealed off in recent years). A great place to go exploring (at your own risk!), enjoy it while you can because the city has intentions to develop it into a public recreation area in the near future. The nearest transport stops are 'Kapelanka' and 'Norymberska;' take tram 18 or bus 194 to get there.