Three bolt equipment

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Three bolt equipment, (Tryokhboltovoye snaryazheniye, Russian:Трехболтовое снаряжение, Russian:трехболтовка) is a type of standard diving dress which was used by the Russian Navy in the 19th and 20th centuries. This standard diving dress consists of an air-supplied copper helmet that is fastened to a waterproof suit by three bolts, together with the diving suit itself, two 16 kg lead weights attached to the chest and back, and heavy boots made of copper and lead.


  • Air hose
  • Diving suit
  • Diving helmet – helmet made of copper and brass
  • 2x16 kg lead weights, on chest and back
  • Diving boots – heavy boots, made of lead and copper
  • Diver's knife