TF pre-movie'verse - Optimus and Ironhide cope with the aftermath of Megatron's first attack
This was the problem with tunnels
Ironhide did not mind going in to tunnels, which is what most mechs would have expected to be the issue.
The Head of the Guard didn't worry about the entrance into a narrow space. His scanners could have free rein over the entrance and first few metras within. The mech was also confident that he could deal with anything that might be found inside.
He wasn't fazed by the gigatons of Cybertron that was supported above him. The Architects, the best and sharpest processors of the planet assured him that the structuring was sound. Despite the fact that he snorted to himself a bit over that, he had to agree with the building mechs. 'Hide believed that the planet and buildings resting upon the arch work would remain up there, just as they had for millivorns.