What is the purpose of a 'safety reel' (also called a 'gap reel') carried by cave divers?
-
A
To extend the main penetration guideline when the primary reel runs out
-
B
To bridge a gap between two existing guidelines when a section of line is missing
-
C
To mark the maximum depth reached during the dive
-
D
To serve as a tow line if a diver becomes incapacitated