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waiting for answer from those who know
my wild-ass guess:
you are up a 5000 ft mountain, wait 12 hours so you have no starting pressure group, do a 60 ft dive that counts as an 80 ft dive, new pressure group of 'R', your 1:30 SI time is spent driving down to sea level which somehow lowers your pressure group to 'A' rather than 'C' (maybe excess off-gassing), leaving you with 5 minutes RNT and a maximum TBT of 35 for a 70 ft dive.
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