Tunnels of fire were created in the Toronto Blessing meetings. The bottom line is that Christians form a tunnel through which others can walk over. While walking through the tunnel, the one that forms the tunnel lay hands on you and bless you. During this operation they will, as they learn, give you a piece of the Holy Spirit.
The only thing you'll get is an occult power. Nowhere in the Bible we are taught in this way the Holy Spirit to pass. Indeed, God is the One who gave us the Holy Spirit as collateral. We don’t give the Holy Spirit through!
19 What? know ye not that your body is the temple of the Holy Ghost which is in you, which ye have of God, and ye are not your own? 1 Cor.6: 19
The Bible makes it clear that we have received the Spirit of God, He is not something we can pass. The Bible also warns against laying on hands. Do not let just anyone lay hands on. Still, this is something that happens in the tunnel of fire . Often they encourages you to receive it. Only what you receive, is absolutely not from God.
You also see people, after they have gone through the tunnel of fire get drunk or laughing in the spirit. Some will fall in the spirit. These are all on-biblical expressions, however, when we look into Eastern religions we find the same manifestations as an result of the Kundalini. This kundalini strength is what we see in the Lakeland "Revival" and of course the Toronto "Revival".
By letting yourself in with tunnels of fire you open up yourself to demonic influence. Check out these you tube movies of a tunnel of fire and ask yourself, Is this what I see Jesus and His Apostles do?