Nested dictionary items, how do you access them?

I have just learned about dictionarys and they seem great, but I cannot find a way to directly reference a nested dictionary element. The collection object can be referenced to any level via a reference like MyCol.item(1).item(1).item(1) But nothing i try seems to be able to do the same with a dictionary object. Does anyone know if this just cannot be done? See my test code below for all the different types of references I tried and the errors they produced. Thanks for any information you can offer.

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You have the items and keys back to front - for example:

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