A Tale of Two Lights...

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The Chairman

Chairman of the Board
Scuba Instructor
Divemaster
Messages
73,547
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44,804
Location
Cave Country!
# of dives
I just don't log dives
So, JahJahWarrior and I decided yesterday to dive P1 today. We had our gas, we were both sidemount, our gear was packed (with plenty of redundancies) and we were off to Cave Country for the day. We had decided to head to The Crypt via the Nicholson Tunnel. I had decided to try my Drysuit again, though I know that the neck seal had issues. Gearing up was fast and easy... until I was putting on my tanks by P1. A nice lady helped me sort out my bungee issues, but it was not nearly as smooth as Sunday's dive. Still, I got my stuff together and splashed about the time JJW was finishing up his set up.

Cool.

Then, just as I was about to fire up my light, I spied a piece of glass: the HID bullb was broken. A quick flip of the switch verified that. So off came the tanks, and I popped out to get the other HID light I had in the truck. Did I mention that we traveled with redundancies? Slinging the tanks the second time went without a hitch: Yay! I splashed and immediately turned on my light. Yay! It works. JJW and I finished our pre-dive dance and head into the cave.

After my last forced march, I had asked JJW to lead on the way in, so I can learn his pace. It was nigh on perfect and it felt that we had dove together many times. We got to Pothole Sink and I spied the pile of deer bones. I got JJW's attention and he got some pics. A few minutes later and he was tying in the first jump into Nicholson Tunnel. Here the dive got neat. Isopods were everywhere as were the crawdads who feed on them. My drysuit was already sopping wet, but I really didn't care. The troglodytes had captured my imagination as we wound our way through to the next jump.

Now, saying that JJW's trim is excellent is an understatement. The incline from the end of Nicholson Tunnel is problematic, but he held himself in perfect position as he tied into the line. I saw the perfect transition piece to bring the line in contact with the floor and I moved in to place it. JJW, tied off to the main tunnel easily enough and we turned right for almost 5 feet. I had barely tapped my light head against my inflator hose as I was reaching for it and my light failed. Crap.

JJW, knew immediately that something was wrong and turned slowly giving me the OK sign. He could see me sorting out the issue and was very patiently watching me. I turned the light off for a full minute and tried to re-strike. Nothing doing. My second primary had failed, I had plenty of gas and we were nowhere near The Crypt. After the no-go on the light, I thumbed the dive, struck one of my backups and headed back to the last tie off.

It was at this moment that I felt at peace with the cave. A calm came over me that told me that I would be diving this way again in the not so distant future. I even felt my breathing relax, even though I was already relaxed during the dive. We made our way back stopping along the way to take pics of some of the Crawdads as well as to look at a few interesting features. I hit thirds just before the cave entrance.

To be sure, I felt good about our pace both coming and going. JJW felt the same way (yes, I asked). While I feel that the new HIDs are ultra-reliable compared to the tungsten lights of a few years ago, I just could not bring myself to go further without having all three lights functioning properly. I almost had a third primary, but my rebuilt LED primary is not very bright. It's going back to get really fixed this time.

What I really felt good about was my training and skills up to this point. Mind you, I see areas that I need to improve and I also see limits in what I am comfortable in attempting in terms of penetrations and tightness. But, it's evident that the training has become ingrained in my muscle memory. I was never startled or worried and I was not stressed by having such a dim light to get out with. On the contrary, I had a lot of fun on this dive and felt a certain satisfaction in having the discipline to turn the dive and staying icy calm as I sorted out my options.

BTW... JJW has some interesting pics of some budding cave divers. I hope he posts them for us to see.
 
sounds awesome
that's a very cool part of peacock!
there's a vertical fissure in there on the way to cisteen that's breathtaking
 
Litehedded-- I've only been back towards Cisteen once and it was a working dive (Critter counts) so some of my memory of the tunnels is less than perfectly clear, but I remember a sharp turn or two through a "canyon" of sorts...only I don't remember if that was back there, or in another cave entirely! Is that perhaps the vertical fissure you were talking about?

Netdoc did a great job of helping with line placements, which is great. Of course, I can do them myself, but line running is a team activity, and Netdoc seemed to understand that and take an active interest in making sure the line was run great instead of just so-so. I am used to diving with people who have that same mentality and didn't even think to discuss it with him before the dive, but he did it without question.

And I guess I got lucky and his back was turned the few times I managed to drop too much and kick up some silt. Some dives, I seem to trap more air in the Nomad wing than others, and having huge tanks that require more air in the BC doesn't help.

Beautiful dive, the only way it could have been better is if Netdoc had BrightStar bulbs and I had some strobes for my camera (santa?)

Some people have suggested it would be mean to post the pictures of some other divers that I took, and since SB is supposed to be a friendly forum, and I'm a mod, I'll leave them off here. I will say this: in 2009, I only know of one instructor who teaches people to use single, yoke tanks, with a stuffed long hose. Aluminum 80's are not the best choice for back gas in a cave without redundancy. Single tanks should be dived in an H valve configuration for redundancy. Lights mounted on the bottom of the tank look silly if they are left to dangle very far. BC's look out of place among BP/W's and SM rigs. Most people use more than one bungee on o2 bottles in order to keep their hose from dangling and their reg from getting in the dirt. Tank handles on necks of tanks might present an entanglement hazard. And, pink masks look great on guys with beards.
 
Yeah, I thought my HP 130s were big until I saw your LP 120s. I have tank envy again! :D

BTW, the cause of the second light failure was interesting: the bulb had simply fallen out of its socket. I wonder how often this happens? To be frank, I had heard about primary failures happening, and the possibility (after initial striking) seemed rather remote to me. In fact, JJW and I had discussed this and other topics almost glibly on our drive to Cave Country.
 
I've had the same type of failure from the bulb kinda falling out. Someone (ahem, litehedded) dropped my 18w Halcyon out of the back of my truck. All seemed well till we were 300ft in and I pointed my light straight down. Darkness. I was able to reseat it underwater (trade secret) and we continued the dive. This happened a few times since its hard to completely reseat it while diving.

When I surfaced, it was noticeably looser than it should have been. A quick fix, but it does happen.
 
We've had a light fail to strike due to a loose bulb, but it's never happened during a dive.

On my June trip to MX, I was seriously pushing battery time on my 4.5 aH lights, and got VERY used to deploying backups. Danny told us, during C1, that his goal was that, when something went wrong in a cave, our reaction would be, "Sigh, THIS again," and that was exactly how I felt about my light failures. Good training WORKS!

Isn't it funny, too, how it only takes a few minutes into a dive before you know if you've got the right buddy? And how much the right buddy adds to the dive?
 
My drysuit was already sopping wet, but I really didn't care.

:confused: How did your drysuit get wet? Which one do you dive?
 
I've had the same type of failure from the bulb kinda falling out. Someone (ahem, litehedded) dropped my 18w Halcyon out of the back of my truck. All seemed well till we were 300ft in and I pointed my light straight down. Darkness. I was able to reseat it underwater (trade secret) and we continued the dive. This happened a few times since its hard to completely reseat it while diving.

When I surfaced, it was noticeably looser than it should have been. A quick fix, but it does happen.

you can't prove that
 
:confused: How did your drysuit get wet? Which one do you dive?
My neck seal has never worked correctly as I have a 22" neck. We have tried both latex and neopreme but to no avail. Steve Gamble just might have the cure and I am seeing him this Sunday. Fins are crossed. :D
 
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