The pin badge is casted of brass. On the reverse side of the badge there is a bolt for fastening it to the military uniform.
“Three bolt equipment” is a kind of the standard diving-suit, used by the Russian Navy in the 19th and 20th centuries. It consisted of an air-supplied copper divinghelmet, fastened with three bolts to a waterproof one-piece suit. The diving suit was completed with two 16 kg lead weights attached to the chest and the back, and heavy lead-and-copper boots.
The world’s first diving school was found in Kronstadt on May 5, 1882 by the Emperor Alexander III’s order. In Europe it was an honor to go for training in Kronstadt at that time.
The Navy require two main categories of divers: those who fulfill of combat tasks, and those who provide submarine technical, emergency and rescue works.
The divers provide all the necessary conditions to the troops. They reconnoiter the sea bottom and the coast line in the places of the Marine Corps landing and the ships mooring. They detect and defuse mines and landmines, assist submarines in emergency, take part in vessels repairing, detect and identify sunk equipment.