The photographer/cinematographer inside me totally understands the appeal of that kind of shot. Going under or "inside" things really enhances the impression of flying and that you really are at the control of a 3D camera. However, all that was said previously is good advice. Calculated risk is the key, here. There are heavy metallic structures nearby, which means interference is possible. I scrapped many good shots in the name of caution. Losing a shot is always preferable to the risk of crashing.
Also, I thought maybe an "emergency" button could be made of either C1 or C2, at the back of the controller? I'm not familiar with all the options you can assign to these.