Okay...
Dive 1, 30 minutes, 80 feet, air.
1 hour surface interval.
Dive 2, 60 feet, air. 36 minutes of residual nitrogen time apply, total time allowed within NDL is 14 minutes
Contrast to:
Dive 1, 30 minutes, 60 feet, air.
1 hour surface interval.
Dive 2, 80 feet, air. 23 minutes of...