On Sunday, Elon Musk’s SpaceX saw another rocket explode—this time only minutes after launch. And following what must’ve been a fun night of review for the SpaceX team, the verdict on what went wrong is in: They don’t have a clue.

Early Monday, Musk Tweeted:

Prior to this update, Musk had shared that data suggested “There was an overpressure event in the upper stage liquid oxygen tank,” but the latest Tweet points to causes unknown.

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The Falcon rockets are meant to ferry Dragon cargo capsules to the International Space Station and are thankfully unmanned. This was the first failure of a SpaceX craft on a primary mission. Two other rockets have exploded this year—but where the other two were failed landing attempts, this one exploded mid-flight.

Falcon 9 took with it 4,000 pounds of food that Astronaut Scott Kelly will have to keep waiting for, 30 student experiments, new hardware, a water filtration system, and two HoloLens devices. At a joint press conference with NASA and SpaceX today, space spokesmen assured that the ISS inhabitants can hold out until the next supply. But there’s no denying that this is a set-back for both SpaceX and NASA.

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As for the notoriously exacting Musk, we’re certain he hasn’t slept and has no plans to sleep until the latest Falcon mystery is solved. Who’s ready for a few more thousand engineering-hours of review?

Image of Falcon launch from the ISS via Scott Kelly’s Twitter: “Space is hard”

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