I watched a chunk of this. Really very good indeed, but man it’s bleak. Like, unremittingly bleak. I’m sure they used to show it in the afternoon on telly in the old days.
Connery was well into his spell as Bond when it was made.
Like I said, it's been a long time since I've watched it, but some of the language in it made me cringe the way the officers spoke to the West Indian prisoner - a sign of the times. I didn't catch the very start, wonder if they put up a warning prior to it being shown?

