They are all working to make Elon Musk's dream of shooting travelers from San Francisco to Los Angeles in 30 minutes a reality.
But, only one of those teams is hoping you'll take the time to help them build.
Thomas Lambot is the lead engineer of rLoop, a group comprised of online strangers from around the world who want to build a working hyperloop.
And you can be a part of the team, whether you're an aerospace engineer like Lambot, or not, he says they really want anyone who's interested to get involved.
"It's really open to everybody. We don't close the door. What we say is 'come on in,'" Lambot said.
Amir Khan heeded the call for volunteers.
"I've come here all the way just to do the Hyperloop project," Khan said.
You can join up by contacting the group through their Facebook page.
The final competition takes place in January.
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