Lost #3.21: Greatest Hits
This was pretty much just a build-up to the finale episode. Desmond tells Charlie he’s going to die, but allowing Claire and her baby to get on a helicoptor and be rescued. So Charlie swims down to an underwater hatch, in order to flip a switch so that a radio signal can be sent out to Naomi’s helicoptor. As he gets down to the hatch though, a couple of women pull guns on him.
The rest of the team heads off to send the radio signal out, and to prepare to blow up Ben’s group when they arrive. Jack’s being all Jack, which he hasn’t in awhile, leading and making quick decisions.