One of our most challenging branches of activity is concerts organization. Sometimes we organize events in clubs, sometimes in churches or in the streets (marching bands) still this request was very different and unique. We organized it 101 m underground. The concert took place on 4.06.2017 in Wieliczka Salt Mine. It is UNESCO World Heritage Site, the first one enlisted in UNESCO list from Poland. It is former salt mine with amazing salt chambers, underground lakes and salt sculptures. First of all, the group took tourist rout in the mine and then, in the best well known and most beautiful chamber St. Kinga’s Chapel, they gave a short concert of sacred music for other tourists in this place. St. Kinga’s Chapel has 465 m2 and can gather up to 400 people. Our group counted 22 guests. 11 members of the choir and their spouses. The group is called Haraldsguttene Choir and it consists of men only. ITS Poland assisted with entire concert organization and all agreements necessary for such event. We also organized transfer to Wieliczka and return to Kraków and our group leader and translator help during the whole event. We will remember this concert for a long time.