Polish diver dies in world record attempt to 333m

[1atm]

Tenta di battere il record mondiale di profondità, Sebastian Marczewski muore nelle acque del lago di Garda

Google translate:

TIGNALE . Drama in the waters of Lake Garda . The attempt of world diving record of Sebastian Marczewski , Polish diver, ended in tragedy .

Marczewski had already been on Lake Garda in the summer of two years ago. At that time he had established, in the Campione area, what is, still today, the Polish national record : a dive up to 240 meters deep .

The diver this time has immersed himself between Tignale and the port of Tremosine to try to reach the record of 333 meters , but in today's training, Saturday 6 July, something went wrong .

The Polish is not , in fact, more able to go up again . Immediate the alarm and the researches were immediately started.

Several rescue units have reached the training area, such as the local fire brigade , the divers' nucleus of the permanent body of Trento and the coast guard .

The recovery operations are still in progress, the body would have been located at a depth of over 150 meters .

The diver Marczewski is the fourth Polish diver to lose his life in Benaco since 2017 , all engaged in trying to set an extreme record.

The 41-year-old was born and raised in Stalowa Wol a, a Polish town of over 60,000 inhabitants about 250 kilometers from the capital Warsaw .

He was a former military man who participated in missions in Afghanistan , where he suffered permanent damage to the spine due to a mine explosion .

Once he was discharged, he dedicated himself to diving, Marczewski was a certified diving instructor .

He was fairly active on Facebook (“Iron Diver”) and had won the support of quite a few local sponsors. I think he’s the fourth Polish diver to die in Lake Garda (Italy) in the last 3 years in pursuit of record depths ...

 

[chillyinCanada]

Freediving, yes?

 

[Vicko]

He was trying to break the open circuit record.

 

[Wingy]

From FB the tags seem to indicate he hit 333m - what a sad cost.

 

[wgw04024]

1000' on OC?

 

[helodriver87]

OC seems to be the way to go for depth record attempts. I imagine it's a function of simplicity and WOB, but I don't follow this stuff particularly closely.

 

[Griffo]

Sad. But silly.
Even 99% helium has a density of 8g/l at 330m

 

[Germie]

Rip.

From Facebook:
Seems he reached 333.8 m and did not arrive at 100 m stop. Body recovered at 150.

 

[Germie]

Some background theory about deep diving: with ccr the wob is highert than oc, but it it not only that.
Gasdensity, EADD, equivalent air density depth is something to think about.
At 130m depth, a 6/72 helium has an end of 32 ccr and 29m oc ( n2 and o2 narcotic), so within limits. BUT: the eadd is 46 vs 43 m. So the end is ok, the wob is over 40m.
This means co2 risk. On oc co2 is getting out of your body every breath over the lungfilter.
On ccr the lungfilter works also, but the scrubber must absorb. At 130 m the pressure is 14 times more than at surface. But your body is producing lets say same co2 as on surface( with higher wob more co2, eadd). But in the counterlungs is the part co2 14 times less than at surface, 14 times more molecules needed to hold same volume of gas in counterlungs. So the co2 is 14 times more diluted. The scrubber has 14 times less chance to bind the co2. This means how deeper, how less effective as works. Oc is then less complicated.

 

[Dominik_E]

Germie, many thanks for this detailed explanation! I had already tried to figure out the reason why CCR seems to become problematic at "shallower" depths than OC, and arrived at the CO2 problem. Very interesting to see it confirmed by someone who actually does challenging CCR dives!