Salt mines. Here’s one in the USA: https://youtube.com/shorts/zXzvUKXhMBo https://youtube.com/shorts/zXzvUKXhMBo Here’s a list of salt mines in the USA: htt

Salt mines. Here’s one in the USA: https://youtube.com/shorts/zXzvUKXhMBo https://youtube.com/shorts/zXzvUKXhMBo Here’s a list of salt mines in the USA: https://en.wikipedia.org/wiki/Category:Salt_mines_in_the_United_States https://en.wikipedia.org/wiki/Category:Salt_mines_in_the_Uni...