Progress being Lost after Crash

Hello, I had gotten Really Far today in Black Mesa, 3/4 chapters, But then my game crashed at questionable Ethics, and when I started it up again, I found all progress had been lost up to a area in on a rail :’(. Even auto Saves were not there… Any Help?

Founded in 2004, Leakfree.org became one of the first online communities dedicated to Valve’s Source engine development. It is more famously known for the formation of Black Mesa: Source under the 'Leakfree Modification Team' handle in September 2004.