REYNOSA, Tamaulipas, Mexico - Mexican authorities found a tunnel that connects a wooden house to the state jail in Reynosa.

The tunnel was found Saturday night. It was 16-feet deep, 45-feet long and 4-feet wide. Video showed authorities tossing bricks to get a look inside the tunnel.

It was discovered by moving around dirt in the area. Authorities used geothermal energy, which detects activities underground.

After finding the tunnel, police raided the prison. They found alcohol, sharp objects and drugs. Four inmates were transferred to different jails in Tamaulipas.