Roeland Okay, I'll take you at your word for now. Before I read your response I did want to point out something else that made me feel more Mines might be added later. Anyone who plays on PC would be able to make out the following:
When hovering the mouse pointer over tiles, movable objects and entrances, all of these will light up in different ways. If it is something you can get to from where you are at (meaning nothing is blocking your path to it or you don't have to get to it from another screen), then it will light up green. Otherwise it lights up red. In this particular instance, this entrance in the last scene lights up red, with arrows in a square pointing up and down to indicate it is an entrance. So it would seem this entrance is active for some reason, either because it will be used later or maybe as a ruse by the designers. Either way, I didn't want to dismiss it out of hand what with the other things I mentioned.