I know Mark has done a thread on this already, but in the spirit of the course I wanted to have my own
So here's my report. The credit for most of the photos belongs to Matt.
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Everyone has their own motives for doing a course. I like to continually try and improve my diving, and so when Mark told me he wanted to do CCR cave course I was very interested. We tried a few UK based instructors, but they either took months to reply to emails, were reluctant to teach in Mexico, or the dates didn’t work out.
Our Instructor
Based on reading various internet reports, Mark and I independently came up with the idea of going with Matt (MattMexico on RBW) and
PROTEC and I’m very glad we did.
Matt 
Matt is one of the most experienced cave divers out there. He has been on many expeditions, pushed many caves, and is the IANTD rep on the Quintana Roo Safety Committee, as well as the main IANTD man for Central and South America. He is also a very experienced Instructor (one of only five IANTD Cave Instructor Trainer, Trainers in the world) and has a reputation for nice bloke on the surface but merciless underwater.
This reputation turned out to be true.
As the course got closer and closer I got more and more excited about getting out of the crap, windy, rainy grey UK, and diving in warm gin clear waters. And I wanted to see what the fuss about caves was.
Getting there and logistics
I flew out with Continental airlines, mainly because they were giving an allowance of 2 x 23kg and 18kg hand luggage. I took most of the KISS in hand luggage, wrapped in two undersuits, with two 21W Salvos to keep it company. One of my checked bags weighted 23kg, and the other 26kg but this wasn’t a problem. The flight was around £550, and took a long time, as I had left myself a generous 4 hour transit time in Newark. (Americans insist you collect your bags and recheck them when you transfer).
Leaving home at 7:15am, I arrived at 11pm Mexico time or 5am in the UK. I was shattered. Despite this I was wide awake at 5am! Bloody jet lag! I was staying at Mom’s hotel attached to the dive centre, which was clean and had fearsome air-conditioning that dried all my kit overnight. It worked out about £20 per night.
Howard (far left, Uhura), Janos (Centre, Spock) and Mark (right, Kirk) 
Friday
I prepped my kit and made sure the rebreather was working, before walking round Playa a few times, which is small and low rise, although the main touristy area is a bit dense at times. I bought a hat so as to fit in and not look like a tourist, then got a cab to Mark and Howard’s hotel where I recovered from jet lag.
Howard and myself passing through a restriction 
Saturday
After introductions, we also met Patrick, who was assisting on the course. We spent the first day was spent doing a lot of theory (including some dry line work) and talking about cave diving. We had hoped to get in the water in the late afternoon, but sadly we didn’t make it, so pushed on with the theory.
The theory was good and despite being very well read beforehand, I learnt a fair bit, especially about communications. There’s definitely stuff there I can use in my UK diving. I go to sleep early (about 8:30pm) looking forward to the diving tomorrow.
A briefing 
Sunday
Our first day in the water, which was spent in Cenote Eden, part of the Pondarosa system. I later found out that this is also known as the “pool of pain”
We kit up in our drysuits. I’m wearing 4th element arctics and am too hot in the Mexico sun. I jump in to cool off, then come back up for my rig.
We do weight checks. I am a couple of kilos overweight, but not too bad. I can cope with this as I used to dive 4kg overweight in fresh water in quarries as I had no ditchable weight on my sea-weighted rig (an ally plate cured this). So being 2kg is a piece of piss in comparison.
Mark and Howard aren’t so lucky, and are both overweighted and untrimmed. We practice for a bit and move some weights around. I’m a bit hot in the 25 degree water so flush water through my hood.
First proper dive is just skills and drills individually around a circuit with our eyes shut. I get entangled a few times, I suspect with a bit of help, but get off lightly compared to Howard who surfaces with just one fin!
Then it’s another couple of dives doing touch contact drills. We’re crap, but get better on the second attempt.
Finally we get to go into the cave. We put in a line, tie into the mainline and off we go. It’s large, lighter than I expected, and great fun. We swim out for a way, then bleep bleep bleep. Howard gets a small cell error, and we call the dive and head home.
Howard and Janos 
Howard and Janos 