- Fixed installations
- Ventilation systems
- Pressurised escape area or intervention shafts
- Vehicle control systems, for example, road traffic lights set to red at either end of the tunnel
- Current status of high-voltage electricity
- Use of any on-site rescue or recovery teams
- Suitability of equipment to function in a tunnel or below ground environment
- Available communication systems
A risk assessment should be carried to consider the use of available intervention options before implementing any that are appropriate into the tactical plan.