I have gotten into the room that's supposed to have the switch(the room you have to shift the bridge to get to) and there seems to be nothing there.Any help would be appreciated

quote Brian Alderson

I have gotten into the room that's supposed to have the switch(the room you have to shift the bridge to get to) and there seems to be nothing there.Any help would be appreciated

This may be a bug. You don't say which section of Thailand.
LEVEL 2: COASTAL THAILAND - PART 4: A PUPPET NO LONGER walkthrough by Stella.

http://www.tombraiders.net/stella/walks/TR8walk/wii/09puppet_wii.html

"Some players have reported reaching this area only to find the pole that opens the door is missing. This is a bug caused by swimming into the underwater tunnel at the start of "The Remnants" chapter. As far as I know, the only solutions are to download a save file without the bug (available on my Underworld Save Files page) or replay from the beginning of Coastal Thailand without entering the tunnel and triggering the bug. (See the Eidos Interactive support site for details.)"

The link to the Eidos support site is stale, Here's a better one.
Doublecheck the spoiler to be sure that's talking about your situation.

Good luck.