Have you tried watching a walkthrough of the level to find the route? Also is it the part where Balex wants you to lower the crate with the mech body inside? And if so did you find the staircase which leads to an upper level where you can find a jumping path to said crate?
IIRC once you are on the first of those crates, all you need to do is shoot the link on the second crate? Check for a red glow on the chain. (I know that the mission is possible as I’ve completed it with all four VHs; I don’t remember having huge issues on that section with any of them.)