I think we should secure the immediate area, first. Make sure nothing wanders from close-by toward us. After that, shelter and food are certainly possible. After that...

[She hesitates, but only for a moment. It isn't that different from exploring the catacombs, so she should not treat it as such. They needed to establish a safe place and a route to get back to it, and then they could go out and delve, explore, and prospect all they wanted.]

Rest, if necessary, and then... I think it would help to familiarize ourselves with the immediate area, so we can start to spread out a bit. Knowing the route from here to the... living quarters would probably be useful, especially if this fog does not clear any time soon. Learning to navigate it easily.

Then, we can direct others whom we may stumble upon.