i am stuck on the one entitled run aground. i think it is the 3rd or 4t…

i am stuck on the one entitled run aground. i think it is the 3rd or 4th level - it shows a jack hammer in the upper right hand corner but it doesn't work when i try to go through the yellow metal bars. i cannot figure out how to get the kitties down to the gate in the lower right hand corner. Help.