Did you Know?
When Paul and Silas were imprisoned in Philippi, a great earthquake shook the foundation of the prison. Even though the doors were opened, Paul and Silas refused to flee, which prompted the jailkeeper to ask them what he needed to do to be saved (Acts 16:25-30).
Source: 1000 Bible Facts
It is amazing how it was a controlled Quake(opinion) it opened the doors but did cause the walls to fall and crush folks.