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.
 Copper and brass three bolt Russian helmet of the standard diving dress |
 "П3" three cylinder diver's pump, made in 1977. (USSR) |
 Diver's knife |
   | Naval Museum of Tallinn : Photo of Three-bolts equipment with hand pump - diving-time.net |
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