Interesting... How did you get off the main area? Was it near the start of the pipe section?
1) After a bit of climbing up I drop onto this struct jutting out from the first tower.
2) Following it to its end there is a color change. (Is this the pipe section?)
3) Climbing that, I stay left until I come up to another support beam going into a building.
4) I take that all the way to the top where and then slide down a little onto a slope that goes on for quite a while before suddenly coming to an end, where I fell off and with no bottom to land on, continued to fall until I quit the game.