Exactly, like the Asse mine and nuclear waste repository in Germany. Which now has 13500 liters of water flowing in each day, dissolving salt formations making for a slightly corrosive environment.
https://en.wikipedia.org/wiki/Asse_II_mine
https://translate.google.com/translate?sl=auto&tl=en&u=https...
This is why salt formations are ideal. The existence of the formation is proof that water isn't leaving the area and hasn't been leaving the area even on geological time scales.