Here are some more details from Ryan about today’s filming.
If you missed the set pics, there was a stunt scene being filmed with a car flipping into the marina. Stand-ins for both Charlie and Desmond were spotted on set and apparently the first run at the stunt did not work well as a cable pulling the car snapped, but the second take was successful and fans were able to catch the action via video.
Here is a set video from LOST Locations and update from Ryan:
It was only after the stunt, and after a lunch break, that the context of the scene became clear. Seated in the ill-fated car were Desmond (Henry Ian Cusick) and Charlie (Dominic Monaghan), perhaps not long after Charlie’s release from the airport holding cell and their subsequent conversation in a bar. Desmond is driving. The pair are arguing. Suddenly, Charlie grabs the wheel from the passenger seat and yanks, and his impulsive act is what sends their vehicle into the ocean.