I feel extremely obligated to post this one, due to the sheer hilarity of it's discovery.
Game mode is capture the key, my team is stationed in the shuttle launch bay, theirs in the aztec ruins. I navigated my way to the bridge area equipped with a rocket launcher and a half vest of armor, disposing of one or two assailants along the way. as i reach the bridge, i discover someone gaurding the other side. I surmise that a viable way to eliminate them was to barrage the bridge with rockets.
I proceed to do this, getting some return fire from their end aswell. With the path clear, i scamper along the bridge to their key. I was lucky, with it positioned right at the entrance to the ravine. I managed to grab it without taking any fire from those at the top of the pit, and extolling my luck, run out of there as fast as possible. Intently focused on my radar to attenuate myself to possible enemies, i fly across the bridge weary of fire from behind. I was utterly astounded when, abruptly, i was greeted with stone in front of my face and the bottom of the bridge moments later.
"E-S has dropped the key" flashed on the screen moments later, to my teams surprise, as i attempt to comprehend what had happened.
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Fancy language aside, it turns out you can open a small section of that bridge with explosives. This is JUST big enough for someone to fit in, and is easily exposed by lining the bridge with mines and detonating them. Easily said, i really wish i recorded that, it was one of my best GE:S moments to date.