go ahead and put on your space suit before exiting! Go ahead and go into one of the crashed spacecrafts, there will be some gas tanks inside. Now go ahead and press "H" on your keyboard, then, go ahead and fly into the stone frogs hand. Once your up there you will obtain the plunger by the skeleton taking a poop on a toilet from probably millions of years ago. Or you can use the gas tanks near the stone frog instead and start flying quickly as you can.