The good:
- Some powerful 3D illusions!

I saw
Sanctum on a 50' HD screen to confirm a theory: The ability of the theater to properly display this technology is just as important as what 3D movie one sees
- Gorgeous visuals whether you see it in 3D or not, especially in the first half.
- Richard Roxburgh is much more capable than I would have guessed as the gruff hero
- Unforgivingly brutal at times. This isn't a gratuitious ultraviolence, but this movie certainly deserves its R rating.
The bad:
- At some point, even a PADI-certified diver like me found the whole enterprise to be repetitive. One really sees how smart Neil Marshall was in the structure of his masterpiece
The Descent.
- Mercy drowning is a fucking oxymoron if there ever was one.
- The dialogue is very James Cameron.
- Ioan Gufford is a vacuum of a person, as always.
- The first minute and the last twenty.
Eventually things take a turn for the frustrating as the movie steadily runs out of gas. The inevitable third act betrayal is completely pointless, an instance of a character being seized by the elder gods of plot machinations. The ending is so deflating that it almost drowns the rest of the movie.
And I LOVE survival movies like this, whether it's disaster, creature-feature, or recent classics like
127 Hours and
The Way Back. Maybe its unfair to compare Sanctum to those films, being that they are directed by two of the best living directors.
PUN TIME! While
Sanctum is shallow and enjoyable, it eventually sinks under its own weight.