I'm sure everyone has see this in ANTR. They had it on the starboard side in the spot where the gymnasium was supposed to be. I don't know why they put it in the film perhaps they were unable to recreate the gym or someone was reading the wrong plans! I don't know but I love that they put it in the film. It makes me wish it had been on the Titanic. It also gives everyone the chance to see something of the Britannic come to life. I'm not sure if there would have been those paintings on the walls but the room looks spot on. It was of course a mirror image of the gymnasium.