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"We didn't scale a wall. There is a mountain near it which we climbed over. And there's a razor wire which the donker cut through," he said.

The helicopters land on a small strip surrounded by razor wire.

As with the lower fence, the only good thing I can say about it is that it’s not topped by razor wire.

We visited the tiny Bulgarian mountain village of Shtit, a sleepy place with dirt roads and rusting farm machinery - a place that doesn’t seem to hold much geopolitical significance, but that’s right at the border, which is marked by a 4m high fence and razor wire.

Back at the wall, the smuggler placed a ladder on the Iranian side, and cut the razor wire at the top to create a path for migrants.