With the market value of table salt no longer being what it was in medieval times, today the Wieliczka Salt Mine is most valuable for its health benefits (and tourist dollars, of course). Given its perfect isolation from external factors, the specific microclimate of the subterranean saline chambers is completely bacteria- and allergen-free and rich in healthy micro-elements such as sodium chloride, magnesium and chloride. Such an environment is brilliant for anyone suffering from asthma, bronchitis, lung inflammation, allergies or recurrent nose, sinus or throat conditions. As such, the salt mine also operates as a health resort offering a variety of single and multiple day health treatments in the Jezioro Wessel (Wessel Lake) and Stajnia Gór Wschodnich (Eastern Mountains Stable) saline chambers located 135m underground. Accessed from the Regis Shaft, individuals and groups who arrange in advance can participate in a number of organised breathing exercises and walks, and even sleep underground in the former horse stables.