Helmet with 3 bolts GKS3m type.
To intervene up to -150 m, the U.R.S.S commissions, at the beginning of the Sixties, a helmet with injector for mixture helium-oxygen-nitrogenizes.
A Russian plunger-spéléo indicated to us that the GKS3m equipment could reach the -300m mixes Helium-Oxygen of it. The little of documents available on this equipment gave it for -150m with the Trimix mixture.
Réf : 003890
Bronze Liner porthole
Total diameter 47 cm diameter glass 30 cm
Réf : 00390
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