Three-bolts equipment
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
Three-bolts equipment, (Tryok'h'boltovoye snaryajzeniye, russian:Трехболтовое снаряжение, russian:трехболтовка) is a kind of a standard diving dress which was used by the Russian Navy in 19th and 20th centuries. This standard diving dress consists of an air-supplied metallic helmet that is strapped with water-protected suit by three bolts.
[edit] Three-bolts diving suit consists of:
Three-bolts diving helmet (one can see it on the bottom picture), diving shirt, lead boots.