Hi and thanks for using 2CarPros.com.
If you truly have 0 compression, there has to either be a valve stuck open, bent and open, or a hole in the top of a piston. Take a look at this link. It is for a gas powered vehicle, but the main ideas are the same. At first, it discusses low compression and then discusses no compression in one cylinder.
https://www.2carpros.com/articles/the-reasons-for-low-compression
I hope this information is helpful. Let me know if you have other questions.
Take care,
Joe
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Thursday, August 2nd, 2018 AT 8:50 PM