We've not gone out far enough that way to make sure there aren't rivers to ford either. Which I would probably be able to cross but not get others to the opposite side along with me. For how little we know there could be another lake between us and her lab and the only true access is the tunnels.

[Now he needs to think about bringing rock climbing and river fording gear along with everything else. With the luck they've had there'll be a volcano or something.]

Would you like to be our navigator? Having someone at a home base who could track our location and let us know if we're off track, would be incredibly beneficial.