Taking into account the route of the Russian fleet, the (very) slow speed that it went by and the fact that, usually, the fleets of NATO of SSK´s and SSN´s train against their fellow surface fleets, this was a unique oportunity to actually train “against” a possible OPFOR fleet i would imagine that the biggest problem of the “western” submariners was not bumping into each other! I am willing to bet that the kuz and its fleet were shadowed by the RN, by the Dutch, by the Spanish, by the Portuguese, the French, the Italians and the US Navy submarines.