Not having super characteristics, not standing out for their gigantic size, not receiving sonorous anniversary names, Project 670 boats are undeservedly relegated to the background; even quite heroic campaigns and deeds during the period of their intense service remained in the shadows. From July 25, 1977, they were reclassified from cruising to large, with the index changed to "B", then from January 1978 they returned to the status of cruising, and in 1991-92 they were finally reduced to "large" with all the ensuing consequences - pay, prestige and etc. Overnight they were put into disrepair, written off - very little time will pass and it may turn out that there will be no place left for them in the glorious history of the Soviet Navy... I do not undertake to name all the names, to fully reveal all the subtleties of the design and the vicissitudes of the service - I consider the task of this work to be a brief introduction with a successful project, with the “rattlesnakes” of the seas and oceans, as the sailors of the fleets opposing us on the sea roads in the 70s cautiously called them.