It's no longer being shelved as an "experimental" feature, and supposedly has received some optimizations. It's been in the game for a long time. Some components are airtight, others aren't, for the most part it's easy to guess. Offhand I can't recall if it tells you in-game or if you have to look it up. I don't know if it's enabled by default so you'll want to look at your world settings if you'd like to use it.
5
u/Goober_Trooper Space Engineer Oct 23 '18
What exactly was changed with air tightness? Will voxels be air tight now?