Photo credit: http://www.sfx.co.uk/2013/04/06/doctor-who-7-08-cold-war-spoiler-free-preview/
Cut and pasted from the Radio Times website:
The Doctor and Clara land on a damaged Russian submarine in 1983 as it spirals out of control into the ocean depths. To make matters worse, an alien creature is loose on board, having escaped from a block of Arctic ice - and with tempers flaring and a cargo of nuclear weapons, it's not just the crew but the whole of humanity at stake.
This episode is written by Mark Gatiss.
Follow the links to the Radio Times features on this episode:
This is the trailer: