You go inside in the cave and get in in places you don't see in regular tour but they rent you safety personal equipment to do it
It is an extended exploration of the caves that is a bit more extensive. It is about 3 hous hours long and be prepared to climb and crawl a bit. You will be supplied your own flashlight as well since it is less lit than the main path. Youngest explorer they will take is 7. Currently, it is booked outa month in advance because they can only take a handful of yours a day.
The hidden passages tour is where they take you off the regular lit path. You get to explore another branch of the cavern system. You explore using a flash light that is given to you
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