Hi, It was a movie when I watched long years ago, maybe in 80's. Two men (one of them was tummy, blonde and had mustache, and the other was thin) were in such kind of a bank and there were huge vault doors. They took a picture of vault door and put it in front of the security camera. When they were putting it, also they interfered the whole system and camera watching-guards assumed that it was mices. They took the diamonds (I am pretty sure it was diamods, but maybe some kind of valuable things) and escaped via canalization..

Do you know this movie?