Kingdom Hearts that one part confuses me

I've beaten the game and finished everything in the game...
so I looked up the excellent guides here but there is one chest I have never gotten in hollow bastion its the one under ground in the waterway where there are a bunch of spinning doors and switches there is a chest directly in front of you but I cant get to it. I tried for hours but nothing does anybody know what I'm talking about please help... its the only one I've never gotten!

 

You need Beast, I think that's what the problem is, and you have to look for a crumbling wall. As soon as the bottom command thing changes to "Break wall" or something like that, bursts through the wall and there's a couple of chests in there.

Tell me if this isn't what you were talking about.

 

If it's the one i am thinking:
Go to the save point in the Water somethingthatiforgotthename use Blizzard on one of the bubbles and jump on it,once you're in it jump again without moving and Sora will hold on something that i actually forgot what it is,look around and Glide to the chest.

Sorry for the bad explanation.

 

after that the room with the many doors that slide left and right

 

Use Blizzard on a bubble next to the save point,jump on it,jump again,try to hold on something,look around if you see the item Glide to it.

 

I never take it too. What are inside it (or the others)???

 

I think it's a Gummy Piece on the English version,but on FM is a Power Up.

 

Oh, well, it's not much :mellow:

 

thanks guys I'll try it right away!
even if it is something dumb I STILL WANT IT!!!!
never thought of using blizzard! on the bubble.