As many a drunk and fair dodger have noticed in the passed, steel gratings cannot be bent, bashed, or squeezed through, nor can this one be climbed over sinse it stretches right up to the cieling of the tunnel.
You can't think of any item you have that looks the right size for the slot, it's too big for a gold coin, and too narrow for most anything else.
With a disappointed shrug, you turn away and clomp off back down the corridor to the west, in search of something that will hopefully get you through the door.
The horrible dungeons of dreadful doom.
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