Just add a solenoid to that RB80 and you're goodMaybe a very long dive at an intermediate depth. One particular cave like this has an avg depth of like 100ft, max 130, but also has extended shallow bits in the 60ft range. 30/30 isn't right, but neither is 21/35 due to the shallow bits and the RB80 po2 drop.
Few and far between are these examples.