@Sherlockkat Like zxc says, you'd be done for! Some have died this way on earlier floors, one of the dangers of completely destructible terrain that can also collapse and/or be repaired by engineers (the latter is how new players are occasionally permanently entombed in walls--well, I say "new" but it almost happened to me once as well
).
but K nerfed it in Alpha 6
From your point of view it was a nerf; from mine it was correcting a mistake since it was intended to work as it does now
(thank you for finding it)
And Sherlockkat had the most powerful launcher currently in the game, enough to blow through
anything. There are some even more destructive launchers, but you can't find them yet.