This is the "Underwater Iron Man Jetpack" and it was built by Eclectical Engineering. They say that strapping electric motors to yourself can make you swim faster than Michael Phelps. Here's how they did it. They created a watertight seal for the jetpack's battery and the first tests were done in a bathtub. Eventually, they went to bigger bodies of water. How fast did they swim? The jetpack could propel the swimmer to 6.25 mph. This tops Michael Phelps' 6 mph record. Eclectical Engineering spent roughly 60 hours and $1,000 to make the jetpack a reality. Eclectical Engineering is looking to improve the design. A jetpack 2.0 may be coming soon.
Read more: http://www.businessinsider.com/sai