In the early 2000s, in the village of Solotvyno in Transcarpathia, out of eight salt mines operating at the beginning of the 20th century, salt was mined in two. Since 1968, underground treatment rooms of the Transcarpathian Regional Allergological Hospital were arranged in the idle mine No. 8, and underground chambers of the Republican Allergological Hospital were arranged in the idle mine No. 9 for the treatment of patients with asthma and bronchitis by speleotherapy, using the microclimate of salt mines.
In 2008, due to a sharp rise in groundwater, operating mines and departments of the Allergic Hospital were closed. There is a project to build a new allergy hospital in a salt mine a few kilometers from Solotvyno. Now the medical complex of the village is based on the healing brine of salt lakes, including the lake Kunigunda.