See, that's where it goes wrong, already at your step 2.
First off, there are no grenates, no medkit, no nothing. If I go down the first ladder you mention, I end up not in a room, but at the bottom of a shaft, where I can only take two or three steps ahead to reach the other end. Now through the hole that I described, I can SEE the room that I think you are referring about, but I can't enter it because I'm actually one level below it, and I can't jump up. It just seems that Indy's going to far down in the shaft or something, but I don't know how to make him not do that...
Maybe I should e-mail LucasArts about it...
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