Cave Diving, Cave Exploration and Cave Mapping in Yucatan, Mexico
Caver Diver at Little Brother Cenote at Chac Mool Mexico

The Pit Revisited

A CCR DPV cave dive to the back of Jill’s Chamber by Patrick and Hans.

Since the last dive, there was nothing on my mind then that bloody restriction at the end of BMB. If you don’t believe me, then talk to anybody who spent time with me. One thing was clear, I had to go back there again, with more time to really look at it and make sure that it is too small to fit with my Meg and two stages. Hans came up with the idea to sidemount our two Megalodons, which I really like, but it will take a lot of time and effort to make that rig work and giving my work schedule at the moment, well that will have to wait a little.

With me working every day and Hans going on several trips to the states we had exactly one day to do the dive. The night before the dive, I managed to be back at the shop at about 6PM which gave us 2-3 hours to blend and rig stuff.  We got to work and finished around 8:30PM, mainly due to Hans’ effort.  He put all the stages together and bubble checked them at the pool while I assembled my Meg; going through all of the points in my checklist.

Back home it was time to run the different scenarios that we had discussed earlier through V-Planner and see what was possible. The major difference for this dive was that we added a DPV to the equation.  This enabled me to take a third stage with bottom mix.  The main idea was to have as much time as possible to check out the two chimneys in the BMB that ascend into Jill’s Chamber. I wanted to get a good picture of the two restrictions so I could make a decision on which one and how I was going to pass.

Since our last dive, I had learned that there is still a 1000ft of line waiting on the other side before I would reach virgin cave. So the keyword is contingency. I created these plans:

  • X1 fails
  • Bailout
  • DPV fail with CCR ok
  • DPV fail CCR fail
  • Entanglement
  • Etc etc etc…

After what-if-ing many scenarios and running them through V-Planner, I hit the bed at like 1:00AM.

The alarm rang at 6:00 AM, but I was already awake. After loading the truck and getting stuff to eat and drink, we were headed to Tulum. At Dos Ojos Hans helped me maneuver my truck on the primitive road towards The Pit.  We got there without once scraping the bottom of the truck, how cool is that! The day started awesome.

After we lowered the 7 80cf tanks, the 3 40cf tanks, the DPV and the two Megalodon CCRs we climbed down at the platform to get ready. Hans prepared for his first of two deep dives that day. On the first dive he placed the bailout tanks and connected the descent line to the permanent cave line.  On the second dive he will picked up my deep tanks and fetch the reel. 30 minutes after he left, I was submerged.

I put the dpv in third gear and made my way down towards the start of the line.  I was carrying 3 80cf tanks with deep bail out and a 19cf with air for suit inflation. Arriving at the start of the cave line I dropped the 19cf tank and plugged one of the bail out tanks in my suit. I used this short brake to put the scooter in 5th gear and switch set point on the Meg. After that I made my way down the Cardea passage, visibility was even worse than last time so I Ok’ed the line while driving.  The whole time I was in the milky fog, I was worrying a bit about crashing into some rock. It felt like driving very fast in dense fog with the headlights on.

As I arrive at 65M (213FT) I turned down towards the bypass at 85M (278FT). Who would have thought that the Po2 could spike that fast when you scooter at depth . I quickly stopped and did a dil flush to get the Po2 back under control and checked my gauges.

I realized that I was really kind of late, so I decided to drive through the Bypass. Maybe it sounds a bit irresponsible but in 5th gear (of 9) you are really not moving so fast.  My head was ducked behind the propeller and I was cannonballing through the bedding plane at 85M (278FT).  I was loving it!  I got the feeling it was getting too tight, so I let go of the trigger.  Five seconds later the handle of my Meg hit the ceiling!  Luckily, I had slowed down enough to minimize the impact.  I smiled and took a mental note to not do that again.

Out of the bypass, now I was driving to the end of the Wakulla Room. I arrived there at minute 8 which was really super slow. Call me a coward, but it was the first time I scootered at this depth and didn’t want to go full speed.

I hooked the scooter to the line and let go. Hey, who would have thought, going with a perfectly neutral scooter to 90M (295FT) and it is positive like hell. I didn’t consider the density of the saltwater down there. It was kind of funny, I clipped the scooter off and started to remove one of my stages to leave it there with the scooter.  When I looked towards the line, the line and scooter were gone. I look up and there they are, the DPV pulling the line towards the ceiling. I attached the tank to the line and this pulled everything back in place.

Swimming down towards BMB felt different, I was way more relaxed than last time, maybe because I had more Helium in my diluent or just because I had been there before. I came to the T again where the line is touching the ceiling, this time I stopped and pulled the line down to the floor to pin it under a tiny rock which turned out to be a bad idea.  The line cut through the rock like a hot knife through butter and a nice cloud of zero visibility covered my hands. Second try with a bigger rock was more successful.

I can’t say why but again I ignored the chimney to the left thinking that I will check it out on the way back, after I had looked at the other one. Swimming back towards the other restriction I felt really confident, the dive went very well and I still had a lot of the 20 minutes I had planned at 105M (344FT). Also, I started to look around more to get a feeling for the cave and its flow rather then just following a line.

As I arrive at the restriction, where I had turned my last dive, I looked up through the chimney and thought well it looks tight but if I would be in 15M (49FT) I wouldn’t hesitate a second. I can do it. So I did. It actually went way smoother and I had less contact than anticipated but still quite a lot. The chimney ascents from 105M (344FT) to 96M (301FT) where the tight hole spits you out in yet another gigantic borehole style tunnel, Jill’s Chamber.

Huge boulders split the room in half and oh my god it felt so good to be there and see it. I forced myself not to look down where I was sure the restriction was silted out completely and that was a pretty scary thought. So I just started to swim forward into the room, first slowly looking around then a bit more confident. Coming out of the restriction, I saw another line paralleling the one I was on coming from behind me. The lines stay side by side until the moment I turned some 5 minutes after the restriction. I found the end of a line with a new line tied on to, so somebody furthered exploration from that point. I figure that it is the end of Jill’s Chamber and the beginning of the Next Generation Tunnel also due to the fact that the room starts to pinch back down into a smaller tunnel.

On the way back I was super stocked and happy enjoying every second of looking around in this marvelous place. Coming back to the restriction I noticed two things: one the tunnel actually continues and is the source of the line that is parallel and two a zero visibility cloud comes out of the restriction making it look like a volcano that blows out tons of smoke.

Just on top of the restriction I invert one hand on the line, one hand in front of my head for protection. Basically I look like a Padi Instructor demonstrating a proper 5 point ascent just instead of swimming up I swim down. Squeezing through the restriction I arrive at its bottom, now I just need to arch my back to get under the ceiling. As I read the tie off at the start of the restriction I am relieved, I made it, I am on the other side.

Swimming back I passed the T that I had put back where it belongs down on the floor and I am heading out of the BMB. Because of the tension I had created placing the line some parts of it now had disappeared in the rock. It is unbelievable how soft the rock is there.

Ascending along the line back to the scooter and my stage, I have to admit it felt good when I pulled the trigger and the thing worked. On the way back to the bypass my X1 lets me know that time to surface now is 2h20min, not so bad, thank god Jill’s chamber is shallower then the BMB.

At the bypass I thought that maybe it is smarter to push it through rather then driving which worked just fine. From the bypass coming back was easy and the very first time I ever decompressed while driving a DPV. My first stop was at 71M (232FT) driving through that white cloud back towards the ascent line.

After a couple of short stops I arrived at the start of the permanent line and the reel Hans had installed. I dropped two of the deep bailout and took the Triox that was staged prior to the dive.  I also took the 19cf air tank and hooked it to my suit. After a couple of flushes my suit was filled with nice warm air rather then cold damn Trimix which felt fantastic. (I will get a smaller suit inflation bottle when Hans comes back from his next trip to the states).

Being bored during deco I took the scooter and was driving around a bit in the huge dome admiring the intense and spiritual beauty of this place.  Finally up at the 12M (40FT) stop, I got rid of all tanks except a 40cf bailout with Nitrox. Hans came back to bring me something to drink and a second hood because my head started to get cold. When he looked at me he could read it in my eyes and immediately mimicked the: did you go through the restriction? When I nodded it was big smiles and hand shaking. What a great day.

Only some 50min of deco left which I spent swimming around to warm up, thinking about future dives, drinking and waiting for Hans who dropped back down to retrieve the tanks and the reel.

Let me say something loud and clear, there is NO WAY I would have been able to do these dives without the constant support of my friend and dive partner Hans. Thank you!  We are a true team and I am looking forward to the day where I will support his first dive to the Wakulla Room and beyond.

I also would like to thank Pro Tec Advanced Training Facility for providing us with tanks and the scooter as well as Margaret at Liquivision for some of the best customer support and a great product.

If you are waiting for the next story you need to be patient, Hans is gone and I am loaded with work but starting from mid September we should be back in business.  Next plan being two more tanks and a scooter through the restriction starting to depo gas in Jill’s chamber and maybe finding the end of the line!?!

This is my story of The Pit and it is to be continued…

Here is an awesome video that karin pointner put together of our project:

You need to a flashplayer enabled browser to view this YouTube video

6 comments

1 Paul { 08.27.08 at 10:20 am }

Well done Patrick, its realy a good story, I’m really proud of you.

2 Etienne { 08.30.08 at 7:40 am }

There always some no-diving people how ask me why I continue to take advence course and why I don’t stop at the level I already archived. I think everyone answer those kind of question at least one. For me, I always say that I try to get a level of excellence and I try to push my how limite, not for the trill to push but to become always better.

What you done here in the pit is really impressive and it was done on a intelligent way. You can be really proud of the degree of excellence you archived. Im proud to be one of your student.

Keep going

Etienne

3 Julia { 09.01.08 at 4:08 pm }

Hi from Easy Water Instructor!

I can only add to the comment of your dad that I m proud of you as well!!! You really know what are you doing! Many hugs, my brave man.

With love,
mamaJulia

4 Patrick { 09.01.08 at 9:17 pm }

Thanks a lot mamaJulia, but without the help of your lovely daughter who takes so good care of me and fix me my sandwitches I could not have done it. She also needs to live with me sitting hours in front of the computer planing dives and writing articles. Plus has to listen to me going on and on and on about the Pit.

Best wishes to Egypt,
Patrick

5 Clive O' Driscoll { 06.03.10 at 3:02 am }

Patrick & Hans

I keep reading yer report about the Pit, im in heaven!
Well done to you both and please keep up the fantastic work.

If you have any photos or video could you please post to my e-mail, Thanks

Clive

6 Hans Kaspersetz { 06.03.10 at 6:43 am }

Clive, we do not normally share photos or video by email. However, I will add our YouTube video of The Pit Project to this post for your enjoyment.