How do I find treasure #6 in Lego Indiana Jones?

Lego Indiana Jones for PS2—-For treasure 6 in the Lost Temple, I read “Use a bazooka guy to blow up the iron gate. There is a Treasure in the area past it.” I cannot figure out how to get a “bazooka guy”. It’s driving me crazy! Can anyone tell me how to explode that silver gate and find that treasure!?! Thanks!!
(This is the part where you cross the floating platform and Indy gets the Crystal Skull on the pedestal in the center of the lake.)

Some treasure can only be unlocked during free play.

You need to unlock the bazooka guy in one of the later stories

one bazooka guy is unlockable during the Indiana Jones and the Last Crusade, when you complete the level go back to the college, and buy the guy in the library.

than go to the lost temple, and have the bazooka guy as your main character, and have him fire on the silver gate.

took me a while to figure that out, but finally able to get it

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