I had a bad time with this area also. I found that I had to map it on a separate piece of paper as follows, with the letters showing which elevator leads to which other elavator (ignoring the connecting tunnels):
A
/\ /\
/ \ / \
/ \ / \
B\ / \ /A
\ / \ /
\/ \/
C
B
/\ /\
/ \ / \
/ \ / \
\ /D C\ /
\ / \ /
\/ \/
D
This is just an example. The letters do not indicate actual connections. Hope this helps.
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