Mine recovery Suit


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 Siebe Gorman M.R.S

Date: 03 December 2002

  Mine Recovery Suit with Helmet

JW. Bech


Siebe Gorman





Land of origin



Special Note: 



User group



Part no:



Working principle

Oxygen or SCR


Gas type

Oxygen and Nitrogen


Cylinder volume



Max. cylinder pressure

150 bar


Material of cylinder

Aluminium !


Counter lung inspire

On the chest


Counter lung exhale



Dive time duration



Operating temperature



Magnetic signature



Weight ready to use in Air



Weight ready to use in water




120 feet


Scrubber material







Very expensive



On the back



In helmet






M.R.S. helmet for use with suit and breathing apparatus is equipped with hinged window.











If you have any information to add this sheet please mail it to jw.bech@quicknet.nl References to source and names will always be added!  


Info found:


Origin: http://www.therebreathersite.nl




The experimental Unit was next called in to assist in the counter-measures against the growing menace of German mine warfare. After the finding of the first magnetic mines, it became imperative that mines laid near the coasts should be examined before they were destroyed by sweeping, so that new methods of firing them could be detected at once. A number of officers and ratings were recruited for the hazardous task of examining and, if necessary, recovering these mines by diving on them. The use of ordinary diving equipment was prohibited, as it involved risk to too many lives in the diving boats, and various components were considered dangerous in the presence of magnetic and acoustic mines. It is desirable, too, for obvious reasons, that there should be no delay in regaining the surface, such as would be involved in the carrying out of routine decompression. Self-containing oxygen apparatus suggested itself, but the depth required was too great, as it may well be imaginated that a visit from “Oxygen Pete” would have been most unwelcome when dealing with a mine.
The Experimental Unit further developed the oxy-nitrogen mixture system already used in Siebe’s self contained diving dress before the war. Formulae were calculated so that the suitable proportions of nitrogen and oxygen could be worked out for various depth and conditions in order that the risk of ‘bends’on the one hand, and of oxygen poisoning on the other, could be kept to a minimum.

The experiments resulted in the adoption of the Siebe Gorman Mine Recovery Suit (M.R.S.), a two-piece self-contained helmet suit (R.H. and R.W.G. Davis patent), using a mixture of oxygen and nitrogen which enabled the diver to surface freely from 72 feet without stops, and from 120 feet with only a few minutes on the shot rope. It was, in fact, possible to ascend immediately from 120 feet in emergency with only a slight risk of bends.
Every piece of metal in this suit had to be non-magnetic; aluminium alloy cylinders were used and even such minor items as reducing valve springs and buckles on straps had to be specially made of non-ferrous metal. Non-magnetic steel knives were specially developed and tested.




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