Game crashes after rocket engine

As the topic says the game crashes for me when going down the hole after the three-headed monster gets killed by the rocket engine.

I don’t know how to get past this part. Half way down the hole the game is loading the next area, but it crashes instead. Really annoying.

I would really appreciate some 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.