A spokesperson said that "in late 2020 a Russian submarine being tracked by HMS Northumberland [Type 23 frigate] came into contact with her towed array sonar", adding, "the Royal Navy regularly tracks foreign ships and submarines in order to ensure the defence of the United Kingdom".
In the video capturing the moment of impact, believed to be the first collision between Russian and British vessels since the Cold War, a crew member of HMS Northumberland is heard shouting "what the f*** have I just hit?"
"We are seeing an ever-increasing number of Russian submarines deployed in the Atlantic, and these submarines are more capable than ever, deploying for longer periods of time and with more lethal weapon systems", Lewis said at the Centre for Strategic and International Studies.