In addition to opening up a few new caves, you should also consider that normoxic trimix has some great advantages in some of the caves you might already be diving. Some of the deeper sections in Madison for example.
Anything deeper than 100? and you should be considering some helium. 21/35 is a great gas for quite a few of the caves in the 120-130? depths. And I can think of several that have not already been listed.
Don?t just think 180-200?. Helium is your friend.
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