Sunday, November 11, 2018

Into the dark: Russian Navy frogmen break russian record with 416m dive

Three Pacific Fleet frogmen broke the Russian Navy’s diving record and brandished the national flag as they descended 416 meters into the Sea of Japan during a thrilling underwater rescue training exercise.The experienced divers had to spend three days in a compression chamber before they could begin the journey into the dark void using a diving bell, operating from the Igor Belousov navy rescue ship, the Defense Ministry reported on Tuesday.
During their mission, the frogmen surveyed the area and practiced connecting oxygen lines to a submarine model.
The men also unfurled the Russian flag to celebrate their record-breaking dive.
The previous record of the Russian Navy was set last year when the same squad descended 317 meters. 
(from RT news

However, the record openwater dive in the Mediterranean led to COMEX’s record experimental saturation dive in 1992.

COMEX Hydra 10, Hyperbaric Experimental Centre, Marseille, France, 1992.
The dive protocol required a four-week pre-dive period, two days confinement at 10 m (33 ft), 13 days to compress to 675 m (2,215 ft) breathing hydro-heliox (a.k.a. hydreliox) (hydrogen 49%, helium 50% and oxygen 1%), and three days of bottom stage between 650 m and 675 m.
One of the divers, Théo Mavrostomos, then moved into a separate chamber and continued to 701 m (2,300 ft) for a period of seven hours.
The record experiment required 24 days of decompression followed by 2.5 months post-dive monitoring.

The experimental dive followed COMEX’s Hydra 8 openwater record saturation dive in 1988.
Breathing a gas mixture of hydro-heliox (hydrogen 49%, helium 50% and oxygen 1%), it took four COMEX (Compagnie maritime d’expertises) divers, and two divers of the Marine Nationale (French Navy), eight days to compress inside a chamber to the maximum bottom pressure of 53 atmospheres (780 psi).
A total of six dives were conducted with a total of 28 hours of work at depths of 520 m (1,706 ft) and 534 m (1,752 ft).
Once at depth, the divers conducted pipeline connection exercises in open water.
After completing their assigned tasks, the divers re-entered the chamber for 18 days of decompression.
COMEX divers: Thierry Arnold, Régis Peilho, Patrick Raude, Louis Schneider.
Marine Nationale divers: Serge Icart, Jean-Guy Marcel-Auda

Note : the world record (deepest scuba dive in sea water) was set in 2014 by Ahmed Gabr to a depth of 332.35 m (1,090 ft 4.5 in) : took almost 15 hours of deco to reach the surface.

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