NetDoc once bubbled...
The UPSIDE is that you will be alive to dive another day. I don't mind losing a dive, as long as my buddy or I do not lose our lives... or sustain an injury from not having enough gas.
Pete,
Thats always a good thing obviously.
However, the discussion was a comparison between two HP120 singles versus a single set of doubles. In either case with proper gas management, you always have sufficient air to get yourself and your buddy safely to the surface. In the comparison, with singles you get back on the boat with a full HP120 waiting for you for the second dive. With doubles you may not have sufficient gas to safely make the second dive.
I suppose that there is a very small possibility of this happening. First, your buddy would have to experience some type of catastrophic failure to need to share air, secondly it would have to happen near the end of the first dive to use enough air to make it an issue, and thirdly you would have to find a different buddy for the second dive since your buddy no longer has a working air source and/or sufficient gas.
Just thought it was something to think about.
Mike