Comments from the Russian submarine U-475, Woolwich, London

A little peep behind the Iron Curtain - HJ Jolly, Holland

Loads of complicated pipes - Abbi Taylor, UK

Having lived through the Cold War, expecting to die in a Third World War by the end of the century, I never thought I'd be in a Russian sub - illegible, UK

I would not like to be on this submarine because there are only two toilets - Arun George, India

Dive! Dive! Dive! - Rod Steen, UK