ucfdiver
Contributor
Personally, I don't see the need for one, and don't run one. Once in the cave zone however, even a 2ft long jump is going to get a reel placed.First time I went to JB I was convinced that a primary wasn't necessary (by a well meaning buddy). Just couldn't be silted out, just stop swimming the flow blows you out etc. Afterwards I told him it didn't like it, it didn't feel like serious cave diving to me, and that I probably wouldn't do it again.
That's pretty messed up that a buddy would attempt to talk you out of it however.