Rather than get my X-T10 bashed about in Wookey Hole, used my Lumia 950 instead. Taken in available light, no flash.
WookeyHole by Robb Edge, on Flickr
WP_20170727_11_31_38_Rich by Robb Edge, on Flickr
Loads of folk using phones with flashes going off left, right & centre when it says at start...