Musk shared updates about the project’s progress on Twitter on Monday, saying he and the SpaceX team had spent the whole night working on the “most difficult part of [the] primary structure”: Starship’s giant dome.

In his videos, he shows three of the huge structures at varying stages of construction.

The Mark I prototype of the long-range spacecraft’s launch vehicle exploded during tests in November to see how well it could endure extreme cold, mimicking the conditions of deep space. SpaceX said at the time that the test “outcome was not completely unexpected… nor is this a serious setback.” 

No injuries were sustained in the blow-out in Boca Chica, Texas.

SpaceX is aiming to carry out its first manned orbital flights using Starship in 2020. The reusable spacecraft is designed to bring crew and cargo to the International Space Station as well as on lunar voyages and, if all goes according to plan, to Mars.

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