In Nancy Drew: Sea of Darkness, Nancy needs to use the snowmobile. To get it to work, you need a key and some fuel. Notice the flyer about the snowmobiles on the beam, or on the bulletin board in the museum, which says to talk to Elisabet. Find Elisabet on the ship and ask to borrow the key.
Locate the gas can in the pub’s storage closet. Fill the snowmobile up with gas and use the key to start the engine.
