Where is it?
This is at the tunnel.
    src        edge_attr  dst
0     2  to the right of   18
1     2  to the right of   19
2     2  to the right of    9
3     2  to the right of    5
4     5   to the left of    2
5     5   to the left of   15
6     5   to the left of   13
7     5   to the left of   20
8     6   to the left of   22
9     9   to the left of    2
10    9   to the left of   13
11    9   to the left of   15
12   11   to the left of   12
13   12  to the right of   11
14   13  to the right of    5
15   13  to the right of    9
16   13               on    5
17   15  to the right of    5
18   15  to the right of   19
19   15  to the right of   20
20   15  to the right of    9
21   15  to the right of   18
22   15               on    2
23   18   to the left of    2
24   18   to the left of   19
25   18   to the left of   15
26   18   to the left of   20
27   19  to the right of   18
28   19   to the left of   15
29   19   to the left of   20
30   19   to the left of    2
31   20  to the right of   18
32   20  to the right of    5
33   20  to the right of   19
34   20   to the left of   15
35   22  to the right of    6