The experiment still needs peer review and re-verification but it appears NASA may have accidentally created a warp bubble inside one of the engines that it was testing.
Please keep in mind, there is nothing confirmed of this yet.
Source: http://sputniknews.com/us/20150425/1021360503.html
Video detailing some of Harold Whites work: https://www.youtube.com/watch?v=9M8yht_ofHc
Edit: wow, okay, so someone posted earlier that it must have atmospheric heating. Last I heard the science team is aware of the possibility of atmospheric heating and they are going to run a test in a vacuum in order to either confirm or rule this out.
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Finally!