Timesplitters Future Perfect - In Crows Office on Scotland the Brave

I didn't find the first part of this trick myself, I found it on youtube.

In the room with 3 camera things (I forget what their called) right before you get to captain ash and the Jungle queen, there is a small set of stairs leading up to a small tower like thing and a vintage rifle, walk to the top of these stairs and then slowly walk down and towards the edge while ducked down. This isn't easy to describe in text, but if you do it right you will fall down below the level.

Now for my addition to the trick.

Get out your map (alt-fire on up-link) and walk around and try to get outside to where you fight the tank (yeah, I know easier said than done), if the tank starts shooting at you and you get the checkpoint, re-load at the checkpoint and you should be back on the map at the tank. Kill the tank and go down below with the elevator like usual, and then go into the room where crow usually is, if done correctly you won't have completed the protect captain ash objective so the video won't start, you'll be free to look around the room (note that there isn't much there).