Safety First
Despite proceeding carefully, he knew that it would not be a good idea to do so without preparation. You see, John is a fire department captain! He understands the dangers of simply climbing down into an unknown space below the ground. The structure might not even be stable. He needed to plan it out.

Safety First
The Team
John required help if he planned to pull this off. This was the reason he called his friends. It was important to have a backup in case something went wrong. He had experience rescuing others, so he knew that this was a must. After all, it would be tragic if the old lid collapsed on him while he was alone.

The Team