The Debrief just reported that DARPA just "accidentally" created the world's first warp bubble. The actual paper is available here.
My layman understanding is that warp drives were so far only theoretical because they require the existence and acquisition of exotic matter and negative energy density. However, they're saying that it's the real deal, not just an analogue.
The report only makes a vague statement mentioning the Casimir effect, but I'm not sure how it allows to create a warp bubble. So how does it work?