My wife and I taking a guided caving tour at Laurel Caverns soon and I was curious if anyone had experience with caving and what focal lengths would be good to have. We are doing the lower cave tour and from what I understand, once we get past the 'main cave' with lights, there aren't lights down there. My first thought was my E-M5, Panasonic 14mm and an FL-600R flash kept in a Domke F-5xb bag on a waist strap. I would configure the bag so I can lay the OMD in the bag with the flash still attached for quick access. The 2nd thought was E-M5, Oly 14-150 and an FL-600R. This would give me tons of range, but I couldn't put the camera in a bag with the flash on. Given the dampness and all the wet sand in the cave, I wanted to keep the camera in the bag whenever not shooting. I guess my main question is, does anyone think taking one vs. the other? Would I even need a telephoto option? Any thoughts would be appreciated.