Found this:
"The Descent was released in North America with approximately a minute cut from the end. In the American cut, Sarah escapes from the cave and sees Juno, but the film does not cut back to the cave.
In the 4 August 2006 issue of Entertainment Weekly, it was stated that the ending was trimmed because American viewers did not like its "uber-hopeless finale". Lionsgate marketing chief Tim Palen said, "It's a visceral ride, and by the time you get to the ending you're drained. [Director Neil] Marshall had a number of endings in mind when he shot the film, so he was open [to making a switch]." Marshall compared the change to the ending of The Texas Chain Saw Massacre, saying, "Just because she gets away, does that make it a happy ending?"
The North American Unrated DVD includes the original ending. Recently, the film has been airing on Canada's The Movie Network, which has the original ending. In contrast the American Syfy Channel as recently as August 27, 2010 broadcast the recut version of Sarah escaping, with Juno's spectre appearing beside her in the SUV.
As exhibited on Syfy (Latin America), the Descent retains the original ending, with Sarah awwakening back in the cave facing her dead daughter surrounded by the crawlers."
So you viewed the original, and intended, cut. I should really go get it.
