<p>I checked it by myself, since some time ago raids was my favourite hunting place and I realised, that I don't know the answer ;)</p><p>As Xarkost said <strong>Unstable Tunnels </strong><img alt="" src="https://tibiopedia.pl/images/static/monsters/unstable_tunnel.gif" style="height:32px; width:32px"> are active only during a<strong> wildlife creatures raid</strong>, which takes place on the west side of Glooth Factory middle level.</p><p>First of all Unstable Tunnels <strong>have big area attack</strong>, which looks like poison, but <strong>deals energy damage</strong>. Even thought hits made by one tunnel may be considered as weak one, then it maybe dangerous if player is trapped with 8 monsters and few tunnels next to him.</p><p><img alt="" src="https://www.tibiaqa.com/?qa=blob&qa_blobid=14324087113493340079" style="height:438px; width:600px"></p><p>As it is already said: Unstable Tunnels are able to summon up to 4 wildlife creatures (the most common are Drillworms, but you can also meet Glooth Anemone and Behemoths). Why? I guess that it was designed to make fake crowd on the spawn. It may be problematic to run with a lot of monsters AND try to not trap with those useless ones - because monsters summoned by Tunnels gives no corpses, and no loot at all. When you kill them - they simply puff.</p><p><img alt="" src="https://www.tibiaqa.com/?qa=blob&qa_blobid=11109126121409337041" style="height:353px; width:434px"></p><p><strong>Monsters (summons) won't attack you, untill you stand directly next to the Unstable Tunnel.</strong> On the picture below you can see, that I'm standing next to the summoned Behemoth, and nothing. He doesn't attack me and... simply doesn't see me. I can even attack him, but it won't trigger any activity until I stand 1 SQM nexy to the Unstable Tunnel.</p><p><img alt="" src="https://www.tibiaqa.com/?qa=blob&qa_blobid=14181334492429363112" style="height:482px; width:535px"></p>