Not a top notch episode but a pretty solid one. Scary monster, claustrophobic environment, alien-esque scares. All very tense. Then at the end the Doctor is in a desparate place but luckily the monster has a sense of compassion and honour.
Ice Warrior was a good update. We never see all of him outside the suit? But probably for the best, to avoid unconvincing CG.
Nice to see Brutus from Rome getting work.