Quote Originally Posted by DA Aquamaster View Post
Before switching to ring bungees, I also carried a loop of 550 cord in a pocket that I could bird's head onto a D-ring and loop over the tank valve knob in the event a bungee broke, or when schelpping tanks to or from a sink on the harness. Breaking a bungee in a cave with no way to secure the tank would create a real PITA, but the immediate action to get you out with minimal trouble or delay is pretty simple. Even without 550 cord, using a piece of cave line will work.
I have bolt snaps tied around the tank necks for this (and other) purpose. I also keep a double ender for broken tank butt leashes. One end goes on the rail, the other on the hose retainer. I should actually test swimming with both kinds of failures.