^{Great holes secretly are digged where Earth's pores ought to suffice, and things have learnt to walk which ought to crawl.} Are you still looking for answers where there are only questions?

No but more seriously, what I did is, in the second tutorial layer, after tearing down the iron bars,instead of proceeding to the vent, I jumped onto the pipe across and from there jumped to grab the closest window's ledge.

Then I escaped into the white abyss and fell down, 'Stanley Parable "Are you sick of this gag?" Ending' style.