When you are in the underground tunnels below the Hub, a monster will attack. Use the vine, and it will lasso the overhead steam pipe and repel the monster.
Get the vine from atop the storeroom annex (left of the Living Quarters). Get the robot crab from the Living Quarters doorway, and the robot Sprocket from inside Sully's. You need all three before you can go underground through the Hot Hatch.
The old vine is on the roof of the Storeroom building left of the Living Quarters. Use the steam exhaust fan to lift you to the roof. You will need the vine underground at the Hub.
You use it to lasso a pipe in the underground below the "hot hatch."
Hi, You use it to pull a pipe of hot steam down to blast a plant/dragon thingy.
In the underground below the Hub, you use it to rope a steam pipe to knock out an attacking monster in the pipes.
First you need to get the vine. It's on a roof all the way to the left of the map. Just use the vine when the monster comes.
you use it to defeat a vine monster
In the underground below the Hub (through the hot hatch), there is a thing moving through the pipes and it turns out to be a monster plant. Use the vine to rope the steam pipe which kills the monster plant.
use the crab.
The island opened to general use on September 9, 2010, concurrent with a new island map. Steamworks Island will normally be in the center or bottom center of the map.
Go left along the vine and pick up the Mech Crank. Along with the Mech Motor you recovered from the Production Zone, use it to finish building the Mech walker.
There is a very old Dirty Beaker in the Steamworks Museum (far upper right). Use the machines and climb the vines to reach the beaker. You need this at the Greenhouse in the Laboratory (Production zone, right side of the island).
Use it for the steam terminals