No. It doesn't move very fast.
I wrote Walkthrough for one guy into another Thread. He was in same place than you are...
Scraper Wrote:When you come through the door, and your heart starts to pump, and you walk straight... ...The Worm comes through the roof!
In the screen is text: "I've got seal that door!"
Well, when you come out of the "tunnel" where the Worm is chasing you, turn left.
There is a switch that you'll have to push to seal the door.
After that, you got little time to jump over the first acid pit.
Turn right in the first wooden planks before you do anything else, there is another switch to seal the second door.
After that break the wooden planks and go straight... Jump over the another one with the barrel or break it down too!
After the second wooden planks, there is another acid pit. Jump over it.
Now you supposed to see a door in front of you. Also there is a valve that you'll have to switch around many, many times before you can go through the door. (In this part the Worm comes and eats you if you try to switch the valve)
Well, there is that stone pilar holding the whole roof. Hit it with your Pick Axe...
Now you're finally safe from the Worm and you can peacefully turn the valve and continue your game!