A jetpack that lets you swim faster than Michael Phelps!

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Combining battery-powered motors and water is a recipe for electrocution. That explains why the two inventors of this jetpack spent the bulk of their time figuring out how to create a watertight seal for its battery compartment, which contained powerful lithium batteries. At top speed, the underwater jetpack clocked in at 6.25 mph, breaking Phelp’s record of 6 mph. www.washingtonpost.com/news/innovations/wp/2017/09/22/this-underwater-ironman-jetpack-lets-you-swim-faster-than-michael-phelps/?

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