Deadly Creatures Help

[Hyperion]

I though it was strange too, but this is how I did it.

Try to web shoot out of the tank. This will trigger a scene where the snake knocks down its tanks and move yours. You can now escape. I did this by walking to the opening in top of the tank. There is apparently a spot in that hole which will trigger another scene--you will exit the tank and explore the cool surroundings :)

You should go to gamefaqs for stuff like this.