Question about the sound effects

Just a question for the lead sound designer here, were all the sound effects new recordings, or were they from libraries and websites? All of it is really well done, and I was wondering how it was achieved.

Agree voice acting and sound was amazing! Would love to see you guys do blogs or some sort of articles telling us how the development process went.

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.