We all live in a Soviet submarine

[Guest MrNeutron]

I've made it as far as the submarine. After reclaiming the invisible machine part and my whip and gun, what do I do then? I cheated with the map hints and it points to a red crate sitting on the upper ledge. Obviously I'm supposed to go up there (I wouldn't get this far if I couldn't figure THAT out), but how? I've tried moving those crates and even got the brown wooden one to move on top, but I can't jump from it well enough to any ledge. To jog your memory, this is the room at the end of the first hall after Indy's escape. P.S it's rather nice of the gaurds to just conk you on the head umpteen times instead of getting irritated and shooting you