in rock bottom at the end of the museum instead of going into the tube to the "trench of advanced darkness", exit from the front into "downtown rock bottom"

when you get out, switch to sandy and go over to the teleport box

jump off the cliff onto the slide and use the lasso copter multiple times to fly up the slide

when you get to the top (by mr. krabs) go around the corner to the gate and enter it... since you entered from the back of the "trench of advanced darkness" there will be a spatula right in front of you:D:D:D