I am using Drupal 7 an have three content types: A, B and C. A references to B, B references to C. Now I would like to display a block on nodes of content type A of the following form:

B1

--C1

--C2

--C3

B2

--C4

--C5

--C6

...

I get as far as to display this on a node of content type A:

B1

B2

by adding a Relationship 
"Entity Reference: A bridge to the Content entity that is referenced via B"

and a Contextual Filter based on the above relationship set to "Content ID from URL".

How can I now manage to display the C content which is referenced by the relevant B content?

Any help much appreciated! Thank you!