Red committed murder.
For a highly guarded prison, I think the movie does a fairly good job.
Andy was the only one who escaped. Red was paroled. The two got together in Mexico.In the novella, Rita Heyworth and Shawshank Redemption, they do not see each other again after Andy's escape.
He uses his rock hammer to dig a tunnel to the sewage pipe where he later escapes through.
Red thought it was going to take Andy 600 years to dig a tunnel for escaping purposes.