Also be advised that there are not 25 "distinctive" trails. Probably more like 6. Many of the 25 trails are repackaged subsets of the other trails. (Example: On one of the trails you turn left at the big rock and swim through a short tunnel to the next room, and on another trail you turn right at the big rock and swim around the pillar into that same next room.) After you've been on a half dozen or so of the trails you start to recognize major features and become aware of this. Not that there is anything wrong with that--it's the same way I lead multiple dives through a local quarry to try to keep it interesting for my dive buddies. And it is a beautiful dive with all the different structures, artifacts, and angles at which the artificial lighting penetrates through the darkness.
theskull