begin item 0
 type_id 3862
 name "eopen03"
 id 1
 position -110999 105999 0
 wpdistance 4
 fov 180
 obliqueness 15
 waccuracy2 100
 perception2 100
 perfectionist2 100
 movetimer 3
 crouchtimer 3
 shoottimer 5
 attention 30
 advancetimer 10
 edistances 16 1024
blink_group_a 1           <------------ ADD THIS
blink_parent_a 1          <-------------ADD THIS
end item

When u start making tunnels u must add in the *.mis file the two lines.
U must do that by all the parts off the tunnel.
See below.

U can do that with notepad or textpad.
Make sure that u save the file after it.

There is a new Map making tool but it will lock up your system.
Good Luck.