I just watched "Valley Uprising" on Netflix. It was a very informative and well made documentary about the rise of rock climbing in the valley. There is also a very interesting part which documents how a plane filled with high grade Colombian marijuana that was recovered by climbers who subsequently got rich selling it. I highly recommend checking it out.
A couple links I found about the movie and that scene
https://mpora.com/outsiders/plane-full-pot-crashed-yosemite-park
http://www.outsideonline.com/1869346/valley-uprisings-drug-plane-crash-scene?utm_source=facebook&utm_medium=social&utm_campaign=facebookpost
Here is the video from that above page:
video: http://www.outsideonline.com/1869346/valley-uprisings-drug-plane-crash-scene?utm_source=facebook&utm_medium=social&utm_campaign=facebookpost#ooid=U3YWpzcjqU8qaJCb68HrsL7j31BRty21