In general, there might actually be something in the mine, as Locken aptly put it, or there might be nothing at all. But the fact that we will be given a summary of the mission at the end, just like in Elheim, and the results will depend on the number of locations we explore – that's almost 100%. Therefore, to complete the mission with an S rating, I suggest we check the mine, but not now, but when we get a source of light, for which we will first return to the city. Anders will go first to check for traps and serve as a meat shield if necessary, followed by Eir, and then the torchbearer. If we're lucky, Anders and Eir will also have stealth. How does that sound?
It would also be good if we could somehow find out in advance if there will be methane... Maybe we should take a dog with us...