Things to note before reading:

set this game to english as it defaults to french for some reason

make sure to increase gamma in settings>visuals as this game is dark
also in settings>advanced setting the "light" settings to "low" will mark all key components white

now scroll down if you really cant figure this out

• walk to the exit door and grab the long wooden plank

wait for one of the corpse containers to turn red
once it does drop the wooden plank next to it
wait till the plank catches on fire

take the plank thats on fire
walk to the leftmost corpse container
look up to the water pipe and wait till it bursts
this corpse container should look wet and should
no longer kill you upon entry

Drop the wooden plank (make sure its still on fire)
right next to the oxygen tank thats right next to the
exit door
THEN RUN into the leftmost corpse container
and enter it
Wait till you hear an explosion
then you can leave

now wait till the crawling guy leaves his container
and enters into the next room let him get incinerated first
this takes like 1-2 minutes(not gonna check again)
Go take a piss or refill your water glass

once the crawling guy is sacrificed in the incinerator room
it should be safe for you to exit into the white room

end
(note you shouldve unlocked all achievements by now)

first time I made a guide on anything
I found this cause I got bored and downloaded multiple free SCP games