Why is it illegal to enter old workings without permission?

Entering old workings without permission is illegal primarily because of the presence of unexpected hazards that may pose serious risks to safety. Old mine workings can be structurally unstable due to deterioration over time, making them potentially dangerous environments. They may contain hidden gaps, loose rocks, or unsupported areas that can lead to accidents such as collapses. Moreover, these areas can have low oxygen levels or hazardous gases that are not immediately obvious, increasing the risk of suffocation or exposure to toxic substances.

In addition, access to old workings is often controlled to ensure that only trained personnel who understand the specific risks and safety protocols associated with those areas are allowed entry. This control helps prevent accidents and ensures that emergency response measures can be effectively implemented if necessary.

The other options focus on aspects that are less directly related to the immediate safety concerns. While disruptions to mining schedules and safety protocols are important considerations, they do not directly address the fundamental issue of safety and hazard management that makes unauthorized entry illegal.