Created by UK design student Archie O’Brien, the CUDA jetpack has a top speed of eight miles per hour, according to Gizmodo. When O’Brien learned that similar underwater propulsion devices typically cost upward of $15,000, he thought he could design and build one for much less.

The jetpack works by sucking in water at the front and then pushing it out the back at high speeds using O’Brien’s custom-designed, 3-D-printed, carbon fiber-reinforced impeller. O’Brien credits 3-D-printing technology for allowing him to design and build the first working CUDA prototype in the span of one year. The 45 3-D-printed components within the device are easy to modify and reprint as he improves it.