The Hungarian translation says: For 10 points 1 player may uncover as many levels/ one treasure on as many temple/treasure cards as that player wants to. What's not clear: don't you need to have at least one man on the card where you want to reveal a temple level or a treasure??????
Yes, you need to have 1 man on the tile in order to uncover a treasure or a temple level. You need to have 2 men in order to go down 2 levels or dig up 2 treasures. There is a limit of 2 temple levels per tile per turn. I don't recall if the same limitation exists for treasures.