MV NS Concord is Russian owned, Liberian-flagged oil tanker that gained notoriety in 2014 after it was allegedly connected to the submarine search in the Stockholm archipelago.The oil tanker arrived in the area on October 4 but was later charted as zigzagging across the seas, as if searching for something. The vessel "could be a mothership for a possible submarine," according to Stefan Ring, an expert on military strategies at The Swedish National Defence College.