Was there a mention of spaceships

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In the "GREAT STEM PROJECTS" book is an experiment with a spaceship you can build, follow with the images below. I will explain to those impaired: One pop bottle is smaller round than the other- for there are two. The smaller is painted on top. Each bottle is cut off 10 cm. The tennis bottle is placed inside the two bottles as they are fitted together and taped. A foot pump with a cork in place of the cap is set in the bottle to pump pressure in to make the water burst out to make the bottles lift like a spaceship. The last picture shows how it works in a spaceship.