283 meters (928.5 feet) on DualRebreateher in Dahab, Egypt.

[starnawski]

November traditionally is a month when we are training deep dives. This time main reason is to prepare team and equipment for winter exploration of Hranicka Propast in Chech Republic.

Last deep dive there I completed in 2000 reaching 180 meters on OC and I discovered huge further explorations possibilities. Just not on OCJ. This cave easily can surpass 300 meters and such depth presents new challenges for our team and equipment. Fortunately last few weeks spend in Egypt was able to prove that my DualRebreather is ready and several deep dives trained our team to work as one cohesive unit. Now we have somewhat clearer picture what can be expected on depths below 250 meters.

Egypt is excellent training ground for deep diving. Warm Read Sea waters with easy access to deep sites (shore diving with no need to charter boats); friendly Planet Divers Dahab providing tanks, gases and logistics. In short: all we need to succeed.
Day after day we were performing deeper and deeper dives. Any free time we were spending training emergency procedures. Finally on November 2nd last dive to depth of 283 meters (928.5 feet) with total run time of 9 hours.

All dives were completed in Blue Hole, every time I was swimming there from The Bells on 100 meter depth using scooter lend by Polish divers from Olsztyn; thank you my friends!
More details and video from this dive will be available soon on www.dualrebreather.com (http://www.dualrebreather.com)

Team:
Krzysztof Starnawski - diver, Dual Rebreather HammerHead,
Irena Stangierska - photo and support, sidemount Eques,
Marek Klyta - support, rebreather Hammerhead,
Grzegorz Rutkowski - support, rebreather HammerHead,
I would like also say thanks to Wiesiek Zahor who joined us on last day and provided topside support for our team.

more photos at www.dualrebreather.com (http://www.dualrebreather.com) in galery nr.15

http://vimeo.com/33210412

Krzysztof Starnawski

http://www.dualrebreather.com/galeria/galleries/15_starnas_283metry/283m%20%2821%29.jpg

http://www.dualrebreather.com/galeria/galleries/15_starnas_283metry/283m%20%2824%29.jpg

http://www.dualrebreather.com/galeria/galleries/15_starnas_283metry/X1%20two%20day%20after.jpg

[jlillest]

Congratulations Krzysztof!

I can't imagine the planning and hard work to get to this one dive (and I'm sure it doesn't end there). I'm curious, how long was your deco following the dive?

Also, I noticed the discrepancy between depths on the four computers, can anybody speak to why there might be up to a 10m difference between each of the readings. I figured the pressure/depth gauges would have been better tuned than that. I guess it's still better than equipment from the 50s and 60s, but still a 3.5% or so difference between readings. Obviously, Krzysztof used the shallowest depth from each of the computers and my question here is not attempting to call his record in to question.

Again, congratulations and I can't wait to hear what you plan next.

-Jon

[JamesK]

amazing!

[K Mejean]

That is awesome!!! Congrats on an amazing dive.

[starnawski]

Greetings from my most favorite Tatra Mountains where traditionally I spend winter,

As far as my decompression, I don’t want to give all details since what I did worked for me and for others it may be problematic and can create unnecessary discussion.

In general I kept low setpiont in deep part of dive and was gradually increasing up to maximum on shallow stops.
Profile uploaded from my X1 had conservatism “0” but I had also more conservative variations. During my dive I was choosing one depending how I felt at particular depth and how cold I was feeling as well as possible accident scenario which could happen.

Diluent choice and amount were related to mine experience and necessity to backup one diluent with other and at same time to give additional deco advantage.

Innovative in this attempt was logistic of whole dive. DualRebreather use allowed for me to take all what was necessary to complete dive successfully. Everything needed for my 2 CCR’s, three diluents, additional oxygen and DPV. That’s why we decided to go with shore dive in Blue Hole. Drop line was situated about 0.5 Km from shore, I were swimming there with my support team. After reaching bottom I ascended to 130 meters and from there I did scooter to Blue Hole and completed my decompression in very comfortable surroundings. My support teams delivered to me only water and reading materials and were ready to assist in any emergency from 100 meters up. Whole dive was completed with tanks I took with me from surface on the beginning.

Afterwards I felt very well but for nice diner and beer we waited until next day. After I was sure that I had no DCS symptoms.
I will present more about my dive during February 5th Tech Meeting in Bratislava and other seminars. It’s easier for me to talk than write in English =)

On my Vimeo page you can see short photocast from my expedition.


http://vimeo.com/34001834

I want to wish Happy Holidays and all the Best for the New Year.
Krzysztof Starnawski
www.dualrebreather.com (http://www.dularebreather.com)

[roguediver]

great job.

[mirekW]

can anybody speak to why there might be up to a 10m difference between each of the readings. I figured the pressure/depth gauges would have been better tuned than that. I guess it's still better than equipment from the 50s and 60s, but still a 3.5% or so difference between readings.
-Jon
As far as I know UWATEC used by Krzysztof is an older model calibrated for fresh water therefore 3.5% difference. All other computers were calibrated for salt water and depth difference was up to 3 meters. As you correctly stated Krzysztof used shallowest depth from all of them.
Mirek

[gianaameri]

Congratulations Krzysztof!

How did it feel breathing at 283 meters on a rebreather (the WOB)?

I make from an old spreadsheet (buggy?) that the gas density of a 3/85 at 283 meters is equivalent to breathing Air on a rebreather at 72 meters... which I suspect must have been a horrendous WOB (not nice).

[starnawski]

Short movie shot with helmet camera made by Bartek Grynda. Those are clips from descent to 283m on Dual HH rebreather.


http://vimeo.com/36128329

Krzysztof Starnawski
dualrebreather.com

[henri69]

Gongrats Krzysztof :clapper