I don't know if Dyatlov book about Chernobyl translated in english but it is available in russian

He was in jail for 3 years instead of 10.

He offered other version of the events.

Key difference Dyatlov blamed reactor design and soviet system. And Sherbina , Legasov, etc they blamed operators.

Fact is Legasov informed international community disaster was caused by opetators wrong actions. That was official ussr position. That was a lie.

P.s. i was born and lived in donetsk region before 2014 war. There were 3 coal mines in my town. It is unhealthy job. Soviet and post soviet miners look different not like they are portrayed in series