Cave photography is tricky in two ways. The first is that you must get yourself and your camera into an inaccessible, wet, cold, muddy location and then persuade your friends that they would like nothing more than posing for some considerable time in said location! The second set of challenges is technical. The usual lighting technique is to use large off camera flash guns with infrared slave units to light the scene. These slave units react to sudden changes in light and so should not trigger when you shine your headlight at them - should not! Caves are notoriously black and soak up your puny flashgun light, and so far more is required than one might assume, the auto setting is not much use here. Moisture and mud are not well known for their camera enhancing properties so care must be taken, for this reason many will use the more mechanical SLR bodies of 30 years ago. As one of the growing number to have adopted digital technology I don't anticipate my cave camera lasting as long as that, but find the invaluable feedback available on screen for these tricky exposure and lighting conditions makes the hazard worthwhile.