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Tunnels allows you to put three figures on ground level anywhere on the table and vents allows you to put three figures above ground level anywhere on the table, I was wondering do these effects stack, as in you can place 6 figures anywhere on the table (3 above, 3 below) or are you limited to three using there effects.

Yes you can use both at the same time. See here for rules on when Tunnels and Vents can be used:

http://www.yakromunda.com/index.php?page=faq#TERRITORIES